Quiz 3 1 parallel lines transversals and special angle pairs - Unit 2: Parallel lines and Transversals (day 11) Objective: SWBAT identify special angle pairs and their properties. (3. 1/3. 2) **hw/hw log/storybook: “Parallel Lines/Transversals”/colored pencils Put Cube in your Block Box in front (make sure you tabbed cube 1 with name, block) Bucket A: SOL/TEI questions (stapled, make sure in order and name is on it) Regular Geometry: workbook p. 59 ...

 
Angle Pairs Created by Parallel Lines Cut by a Transversal Vocabulary Transversal - A line that crosses parallel lines to create pairs of congruent and supplementary angles Congruent - Having the same measurement Supplementary - Angles that add up to 180° Angle Pairs in Parallel Lines Cut by a Transversal . Interior . Interior . Exterior .... Workathome jobboard

Dayastar Teacher Terms in this set (37) Parallel lines Coplanar linens that do not intersect Skew lines Lines that do not intersect and are not coplanar Parallel planes Planes that do not intersect Transversal A line that intersects two or more coplanar lines at two different points Interior angles Lie in then same region between lines Parallel Lines and Transversals Date_____ Period____ Identify each pair of angles as corresponding, alternate interior, alternate exterior, or consecutive interior. 1) y x corresponding 2) y x alternate exterior 3) y x corresponding 4) y x consecutive interior 5) y x alternate interior 6) y x alternate exterior 7) y x alternate interior 8) y x May 10, 2021 · When parallel lines get crossed by another line (which is called a transversal ), you can see that many angles are the same, as in this example .lines cut unit 3 parallel and perpendicular lines homework 1 parallel lines and transversals gina wilson unit 3 parallel & perpendicular lines gina 2 gina wilson all things algebra 2014 unit 3 test ... First, students will need to be able to identify angle pairs, then know the properties and relationships. Children and parents can find these math worksheets online or even download the PDF format of these exciting worksheets. Parallel Lines and Transversals Worksheet - 1. Download PDF. Parallel Lines and Transversals Worksheet - 2.If two parallel lines are cut by a transversal, then the corresponding angles have equal measure. THEOREM 3-11. If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one also. THEOREM 3-12. If two parallel lines are cut by a transversal, then the alternate interior angles are equal. Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT. A transversal line is a line that intercepts one or more lines. In the image we show r, s, and t, which are pairwise transversal lines, based on the drawing. Even though the intersection of lines ...The converse of same-side interior angles theorem says that the two same-side interior angles must be supplementary (add up to 180°) for the lines to be parallel. 115° and 75° add up to 190° so lines l and m cannot be parallel. 5. Identify: What are the transversals of A B ↔ and B D ↔. The transversals of A B ↔ are A C ↔ and B D ↔.64. $2.00. PDF. Parallel Lines - Angles Formed by Parallel Lines and Transversals Quiz This is a 22 question quiz that assesses student understanding of the angles formed by the intersection of parallel lines with a transversal.. It includes questions that require students to apply the properties through recognizing the properties and setting ... Jan 13, 2023 · Can someone post the back of the paper on Quiz 3-1 Parallel Lines, Transversals, and Special Angle Pairs Get the answers you need, now! Unit D.3 Transversals: name angle pairs QUIZ. 20 terms Images. sophietheweird. 2.1 Parallel Lines and Angles. 13 terms Images. Abbyh229. Name That Angle Pair. 24 terms Images. jwillard315 Teacher.In geometry, a transversal is a line that intersects two or more other (often parallel ) lines. In the figure below, line n n is a transversal cutting lines l l and m m . When two or more lines are cut by a transversal, the angles which occupy the same relative position are called corresponding angles . ∠1 and ∠5 ∠2 and ∠6 ∠3 and ∠7 ...Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT. Q. Angles on opposite sides of a vertex and are congruent are called _____. answer choices . Vertical angles Test Match Q-Chat Created by asherlylin Terms in this set (11) Select all that apply. Which of the following statements are true of a transversal? It is a line. It is parallel to other coplanar lines. It intersects two or more coplanar lines. It bisects line segments. It can never be perpendicular to other lines. It is a line.Gina wilson all things algebra 2014 parallel lines and transversals answers go to the main content gina wilson all things algebra 2015 unit 11 : 2/18/2011 4:15:30 pm if you have two lines and a third line that is perpendicular to the first two lines, then the lines are parallel ex 1:If two lines which are parallel are intersected by a transversal then the pair of corresponding angles are equal. From Fig. 3: ∠1=∠6, ∠4=∠8, ∠2= ∠5 and ∠3= ∠7. The converse of this axiom is also true according to which if a pair of corresponding angles are equal then the given lines are parallel to each other.2 When two lines intersect, they form four angles with one point in 1 3 common. 4 Angles that are opposite one another are VERTICAL ANGLES. Some people say instead that VERTICAL ANGLES are angles that are across from one another. Angles 1 and 3 are VERTICAL angles. Angles 2 and 4 are VERTICAL angles.1 pt. Angle 3 and Angle 6 are examples of which type of angle pair? Alternate exterior angles. Alternate interior angles. Vertical angles. Corresponding angles. 2.Angle Tasks 1: Parallel Lines and Transversals Framework Cluster Reasoning About Equations and Angles Standard(s) 8.G.5 Use informal arguments to analyze angle relationships Recognize the relationships between interior and exterior angles of a triangle Recognize the relationships between the angles created when When a transversal passes through a pair of parallel lines, special pairs of angles are formed. This video reviews corresponding angles, vertical angles, and...Play this game to review Mathematics. If two parallel lines are cut by a transversal, then each pair of corresponding angles isJul 28, 2022 · Gina wilson all things algebra 2014 parallel lines and transversals answers go to the main content gina wilson all things algebra 2015 unit 11 : 2/18/2011 4:15:30 pm if you have two lines and a third line that is perpendicular to the first two lines, then the lines are parallel ex 1: PARALLEL POSTULATES AND SPECIAL ANGLES (Chapter 2.1) Special Angles Certain angle pairs are given special names based on their relative position to one another or based on the sum of their respective measures. Angle Pairs Created with a Transversal A transversal is any line that intersects two or more lines in the same plane but at different ... Corresponding angles. 11. Multiple-choice. 30 seconds. 1 pt. True or False. Given two parallel lines are cut by a transversal, their same side interior angles are congruent. false. true. Angle pairs formed by parallel lines cut by a transversal. Unit 3 functions and linear equations homework 1 answer key. Angle pairs created by parallel lines cut by a transversal. Quiz 4 2 congruent triangles sss and sas answer key. 1.2 3 practice the unia and the naacp answer key.Oct 15, 2022 · Angle pairs formed by parallel lines cut by a transversal. Unit 3 functions and linear equations homework 1 answer key. Angle pairs created by parallel lines cut by a transversal. Quiz 4 2 congruent triangles sss and sas answer key. 1.2 3 practice the unia and the naacp answer key. Find the measure of angle 1. ... Honors Quiz: Parallel lines with transversals. 78% average accuracy. 117 plays. 10th grade . Mathematics. 3 years ago by . Dana ... Play this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____.If two parallel lines are cut by a transversal, then the corresponding angles have equal measure. THEOREM 3-11. If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one also. THEOREM 3-12. If two parallel lines are cut by a transversal, then the alternate interior angles are equal. Find the measure of angle 1. ... Honors Quiz: Parallel lines with transversals. 78% average accuracy. 117 plays. 10th grade . Mathematics. 3 years ago by . Dana ...Basic geometry and measurement 14 units · 126 skills. Unit 1 Intro to area and perimeter. Unit 2 Intro to mass and volume. Unit 3 Measuring angles. Unit 4 Plane figures. Unit 5 Units of measurement. Unit 6 Volume. Unit 7 Coordinate plane. Unit 8 Decomposing to find area. Detailed Solution for Test: Parallel Lines And Transversals - Question 4. First Mr parallel EF and RO is transversal line angle MRO=angle ROF= (alt.int .angle)toh angle MRO=55 degree and angle ROF =angle 1 toh 55=angle 1 is angle 1 =55 then second EF parallel PQ and OS is transversal line toh angle 2 = angle OSP is = (apt.int angle)toh angle 2 ... Dec 4, 2019 · A transversal cuts across two parallel lines to form different angles. The transversal line that connects is transversal p which cuts across lines r and s. and are outside the two parallel lines, so, they are exterior angles which are located on opposite sides of transversal p. Therefore: are classified as alternate exterior angles. transversal ... In geometry, a transversal is a line that intersects two or more other (often parallel ) lines. In the figure below, line n n is a transversal cutting lines l l and m m . When two or more lines are cut by a transversal, the angles which occupy the same relative position are called corresponding angles . ∠1 and ∠5 ∠2 and ∠6 ∠3 and ∠7 ... May 1, 2019 · When transversals cross parallel lines, they form angles with special angle relationships. The angle pair relationships form two types of special angles. Congruent angles have the same measure. Supplementary angles have measures that add up to ???180{}^\circ???. Types of special angle pairs. Vertical angles share a vertex, but lie on opposite ... Chapter 3 . Parallel . and . Perpendicular Lines. Sections Covered: 3.1 Identify Pairs of Lines and Angles. 3.2 Use Parallel Lines and Transversals. 3.3 Prove Lines are Parallel. 3.4 Find and Use Slopes of Lines. 3.5 Write and Graph Equations of Lines. The student will use the relationships between angles formed by two lines cut by a transversal toChapter 3 . Parallel . and . Perpendicular Lines. Sections Covered: 3.1 Identify Pairs of Lines and Angles. 3.2 Use Parallel Lines and Transversals. 3.3 Prove Lines are Parallel. 3.4 Find and Use Slopes of Lines. 3.5 Write and Graph Equations of Lines. The student will use the relationships between angles formed by two lines cut by a transversal to Play this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____. The activity can be used for notes, exit tickets, or quiz review. The students are given a set of parallel lines cut by a transversal and need to label each type of angle depending on the theorems. Increase engagement with this activity by adding color!You may also be interested in:Angle Theorem Proof ProjectParallel Lines Proof Cut and Paste. Preview this quiz on Quizizz. What is the Angle Relationship. Parallel Lines and Transversals. ... Parallel Lines and Transversals DRAFT. 3 minutes ago. by agettler ...Preview this quiz on Quizizz. Which lines are parallel? Think of your angle pairs and check for congruent or supplementary angles.2 minutes 1 pt Angles on the same side of a transversal, in corresponding positions, and are congruent are called _____. Vertical angles Corresponding Angles Supplementary Angles Alternate Interior Angles 2. Multiple-choice 2 minutes 1 pt These angles are congruent. All of these Corresponding Alternate Interior Vertical 3. Multiple-choice 2 minutesAngles inside a pair of lines on the opposite sides of a transversal and are congruent are called _____.Perpendicular Lines. Lines that intersect to form right angles (⊥) Transversal. a line that intersects two or more lines. Corresponding angles. angles on the same side of the transversal. Alternate Interior angles. angles between 2 lines and on opposite sides of a transversal. Alternate Exterior Angles.This is a great 6-question mini- quiz to assess student understanding of the relationships between parallel lines and transversals given a diagram. The bundle contains (1) practice quiz and (4) quiz versions. Subjects: Geometry, Math Test Prep. Grades: 9 th - 12 th. Types: Activities, Assessment. CCSS:This is a great 6-question mini- quiz to assess student understanding of the relationships between parallel lines and transversals given a diagram. The bundle contains (1) practice quiz and (4) quiz versions. Subjects: Geometry, Math Test Prep. Grades: 9 th - 12 th. Types: Activities, Assessment. CCSS:Preview this quiz on Quizizz. ... What type of angle pair is ∠1 and ∠3? ... Angle Relationships with Parallel Lines and a Transversal . 19.6k plays . A transversal that intersects two lines forms eight angles; certain pairs of these angles are given special names. They are as follows: Corresponding angles are the angles that appear to be in the same relative position in each group of four angles. In Figure , ∠l and ∠5 are corresponding angles. Other pairs of corresponding angles in ...Google Classroom. Below are two parallel lines with a third line intersecting them. 81^\circ 81∘ x^\circ x∘. x = x = ^\circ ∘. Stuck? Review related articles/videos or use a hint. Report a problem. 7. 4.2 minutes 1 pt Name a line skew to FG EH DC AD FB 2. Multiple-choice 1 minute 1 pt Name the 3 lines parallel to CG AE, AC, EG AB, EF, GH AC, BD, FH AE, BF, DH 3. Multiple-choice 45 seconds 1 pt Name the plane parallel to DHFB CGEA ACDB EGHF CGDH 4.Parallel Lines,Transversals, &Special Angle Pairs. When 2 lines intersectcrazy, wonderfulthings happen! 1 When 2 lines, rays or segments intersect, 4 angles are created. 4 2 3 Angles 1 & 4 are a linear pair = 180° Angles 1 & 2 are a linear pair = 180° Angles 2 & 3 are a linear pair = 180° Angles 3 & 4 are a linear pair = 180° Angles 1 & 3 are VERTICAL ANGLES and are congruent.Play this game to review Geometry. What type of angle pair is ∠1 and ∠5? Dayastar Teacher Terms in this set (37) Parallel lines Coplanar linens that do not intersect Skew lines Lines that do not intersect and are not coplanar Parallel planes Planes that do not intersect Transversal A line that intersects two or more coplanar lines at two different points Interior angles Lie in then same region between lines Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT. Play this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____.Play this game to review Mathematics. If two parallel lines are cut by a transversal, then each pair of corresponding angles isWhen two lines are cut by a transversal, if the alternate interior angles are equal in measure, then the lines are parallel. Two lines parallel to the same plane are parallel to each other. Perpendicular lines intersect to form right angles. Two adjacent angles whose exterior sides are opposite rays are complementary.Angle Pairs Created by Parallel Lines Cut by a Transversal Vocabulary Transversal - A line that crosses parallel lines to create pairs of congruent and supplementary angles Congruent - Having the same measurement Supplementary - Angles that add up to 180° Angle Pairs in Parallel Lines Cut by a Transversal . Interior . Interior . Exterior ...Interior angles. The angles inside a shape or in-between two parallel lines cut by a transversal. Exterior Angles. The angles outside a shape, or on the outside of two parallel lines cut by a transversal. Vertical angles. The pairs of angles formed by two intersecting lines. Transversal line. Alternate interior angles cannot form a "half circle" because they are never adjacent. The same holds for alternate exterior angles -- they can never be adjacent either. There is not a formal name for the pair of interior adjacent supplementary angles formed by the transversal and one of the parallel lines. ( 1 vote) Lines that do not intersect and are not coplanar. Parallel planes. Planes that do not intersect. Transversal. A line that intersects two or more coplanar lines at two different points. Interior angles. Lie in then same region between lines. Exterior angles. Lie in the same two regions that are not between lines. transversal. a line that intersects two or more coplanar lines at different points. consecutive interior angles. If two parallel lines are cut by a transversal, then each pair of consecutive interior angles is supplementary. alternative exterior angles. angle on the opposite sides of the transversal, outside parralel lines, and are congruent. MrsSullivank Terms in this set (14) Supplementary angles Angles that sum to 180 degrees Complementary angles Angles that sum to 90 degrees Parallel lines Lines that do not intersect or touch each other Interior angles The angles inside a shape or in-between two parallel lines cut by a transversal Exterior AnglesUnlock the full answer. When transversals cross parallel lines, they form angles with special angle relationships. The angle pair relationships form two types of special angles. Congruent angles have the same measure. Supplementary angles have measures that add up to 1 8 0 ∘.1) Name two more pairs of parallel segments. 2) Name two more segments skew to NM 3) Name two transversals for parallel lines NO and PQ 4) Name a segment that is parallel to plane MRQ. II. Identify the angles that go with the following types. Preview and Download !Created by keelin1011 Terms in this set (31) Parallel lines Perpendicular lines Skew lines Parallel planes Identify each of the following. Identify answer Identify problem 2 Identify answer 2 Identify problem 3 Identify answer 3 Identify problem 4 Identify answer 4 Transversal A line that intersects two coplanar lines at two different points.Transversal. A line that intersects two coplanar lines at two different points. The transversal t and the other two lines r and s form eight angles. Corresponding angles. Lie on the same side of the transversal t, on the same sides of lines r and s. <1 and <5. Alternate interior angles. Another Type of angle pairs formed is Corresponding Angles When two lines are crossed by another line ( Transversal ), the angles in corresponding positions are called corresponding angles . Tags:Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ... Test Match Q-Chat Created by asherlylin Terms in this set (11) Select all that apply. Which of the following statements are true of a transversal? It is a line. It is parallel to other coplanar lines. It intersects two or more coplanar lines. It bisects line segments. It can never be perpendicular to other lines. It is a line.If two lines which are parallel are intersected by a transversal then the pair of corresponding angles are equal. From Fig. 3: ∠1=∠6, ∠4=∠8, ∠2= ∠5 and ∠3= ∠7. The converse of this axiom is also true according to which if a pair of corresponding angles are equal then the given lines are parallel to each other.A transversal cuts across two parallel lines to form different angles. The transversal line that connects is transversal p which cuts across lines r and s. and are outside the two parallel lines, so, they are exterior angles which are located on opposite sides of transversal p. Therefore: are classified as alternate exterior angles. transversal ...Jul 28, 2022 · Gina wilson all things algebra 2014 parallel lines and transversals answers go to the main content gina wilson all things algebra 2015 unit 11 : 2/18/2011 4:15:30 pm if you have two lines and a third line that is perpendicular to the first two lines, then the lines are parallel ex 1: Complete the statements below by expressing your understanding on parallel lines cut by transversal. 1. If m<4 + m<5 = 180°, then the two angles are _____. 2. If a pair of parallel lines are cut by transversal then the vertical angles are _____. 3. When two parallel lines are cut by transversal then the alternateIf two lines which are parallel are intersected by a transversal then the pair of corresponding angles are equal. From Fig. 3: ∠1=∠6, ∠4=∠8, ∠2= ∠5 and ∠3= ∠7. The converse of this axiom is also true according to which if a pair of corresponding angles are equal then the given lines are parallel to each other.Detailed Solution for Test: Parallel Lines And Transversals - Question 4. First Mr parallel EF and RO is transversal line angle MRO=angle ROF= (alt.int .angle)toh angle MRO=55 degree and angle ROF =angle 1 toh 55=angle 1 is angle 1 =55 then second EF parallel PQ and OS is transversal line toh angle 2 = angle OSP is = (apt.int angle)toh angle 2 ... transversal. a line that intersects two or more coplanar lines at different points. consecutive interior angles. If two parallel lines are cut by a transversal, then each pair of consecutive interior angles is supplementary. alternative exterior angles. angle on the opposite sides of the transversal, outside parralel lines, and are congruent. View parallel lines and more.png from MATH 10 at Weston High School. Quiz 3-1: Parallel Lines, Transversals, and Special Angle Pairs er x Using the diagram to the right for questions 5-9, classifyFind the measure of angle 1. ... Honors Quiz: Parallel lines with transversals. 78% average accuracy. 117 plays. 10th grade . Mathematics. 3 years ago by . Dana ... Perpendicular Lines. Lines that intersect to form right angles (⊥) Transversal. a line that intersects two or more lines. Corresponding angles. angles on the same side of the transversal. Alternate Interior angles. angles between 2 lines and on opposite sides of a transversal. Alternate Exterior Angles.A complete parallel and perpendicular lines unit for high school geometry!Topics include:special angle pairs (vertical, adjacent, linear pairs)parallel lines cut by a transversal (alternate interior, alternate exterior, consecutive interior, consecutive exterior, corresponding)angle measures (includMrsSullivank Terms in this set (14) Supplementary angles Angles that sum to 180 degrees Complementary angles Angles that sum to 90 degrees Parallel lines Lines that do not intersect or touch each other Interior angles The angles inside a shape or in-between two parallel lines cut by a transversal Exterior AnglesPlay this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____.

If two coplanar lines are cut by a transversal so that a pair of alternate exterior angles are congruent, then the two lines are parallel. If two parallel lines are cut by a transversal, then the alternate exterior angles are congruent. Angles between 2 lines and on the same side of a transversal.. Docs

quiz 3 1 parallel lines transversals and special angle pairs

When two lines are cut by a transversal, if the alternate interior angles are equal in measure, then the lines are parallel. Two lines parallel to the same plane are parallel to each other. Perpendicular lines intersect to form right angles. Two adjacent angles whose exterior sides are opposite rays are complementary. Preview this quiz on Quizizz. What is the Angle Relationship. Parallel Lines and Transversals. ... Parallel Lines and Transversals DRAFT. 3 minutes ago. by agettler ...Perpendicular Lines. Lines that intersect to form right angles (⊥) Transversal. a line that intersects two or more lines. Corresponding angles. angles on the same side of the transversal. Alternate Interior angles. angles between 2 lines and on opposite sides of a transversal. Alternate Exterior Angles.In all cases, since our Line AR and TO are parallel, their corresponding angles are congruent. Exterior angles. Those same parallel lines and their transversal create exterior angles. An exterior angle among line constructions (not polygons) is one that lies outside the parallel lines. You can see two types of exterior angle relationships:Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT. First, students will need to be able to identify angle pairs, then know the properties and relationships. Children and parents can find these math worksheets online or even download the PDF format of these exciting worksheets. Parallel Lines and Transversals Worksheet - 1. Download PDF. Parallel Lines and Transversals Worksheet - 2.Preview this quiz on Quizizz. Which lines are parallel? Think of your angle pairs and check for congruent or supplementary angles.This is a great 6-question mini- quiz to assess student understanding of the relationships between parallel lines and transversals given a diagram. The bundle contains (1) practice quiz and (4) quiz versions. Subjects: Geometry, Math Test Prep. Grades: 9 th - 12 th. Types: Activities, Assessment. CCSS: Dayastar Teacher Terms in this set (37) Parallel lines Coplanar linens that do not intersect Skew lines Lines that do not intersect and are not coplanar Parallel planes Planes that do not intersect Transversal A line that intersects two or more coplanar lines at two different points Interior angles Lie in then same region between lines Study with Quizlet and memorize flashcards containing terms like True/False - A transversal must intersect two or more parallel lines., Use the following figure to answer the question. Angle 1 and Angle 4 are _________ angles. corresponding vertical supplementary adjacent, Use the following figure to answer the question. Angle 1 and Angle 3 are _________ angles. corresponding vertical ...When a transversal passes through a pair of parallel lines, special pairs of angles are formed. This video reviews corresponding angles, vertical angles, and... Engage live or asynchronously with quiz and poll questions that participants complete at their own pace. Lesson NEW Create an instructor-led experience where slides and multimedia are combined with quiz and poll questions. 2 minutes 1 pt Name a line skew to FG EH DC AD FB 2. Multiple-choice 1 minute 1 pt Name the 3 lines parallel to CG AE, AC, EG AB, EF, GH AC, BD, FH AE, BF, DH 3. Multiple-choice 45 seconds 1 pt Name the plane parallel to DHFB CGEA ACDB EGHF CGDH 4.In all cases, since our Line AR and TO are parallel, their corresponding angles are congruent. Exterior angles. Those same parallel lines and their transversal create exterior angles. An exterior angle among line constructions (not polygons) is one that lies outside the parallel lines. You can see two types of exterior angle relationships:Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ...A transversal line is a line that intercepts one or more lines. In the image we show r, s, and t, which are pairwise transversal lines, based on the drawing. Even though the intersection of lines ...When transversals cross parallel lines, they form angles with special angle relationships. The angle pair relationships form two types of special angles. Congruent angles have the same measure. Supplementary angles have measures that add up to ???180{}^\circ???. Types of special angle pairs. Vertical angles share a vertex, but lie on opposite ....

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