1. Angle Relationships

2. Angle Symbology Symbol Meaning Angle “A” The measure of angle “X”
Angle “A” is congruent to angle “B”
Angle ABC where point B is the vertex
Line segment AB is perpendicular to segment CD
Line “a” is parallel to line “b”

3. Adjacent Angles
Side
Have a common vertex and a common side, but no common interior points. 1 2
Common

4. Vertical Angles
Are formed by 2 intersecting lines and are opposite each other. Vertical angles are congruent. They have the same measure 6 3 5 4

5. Supplementary Angles W
Two angles are supplementary if the sum of the measures of the two angles is 180⁰ X Y Z
Angles
Two adjacent angles that for a straight line are supplementary to each other

6. Complementary Angles R
Two angles are Complementary if the sum of the measures of the two angles is 90⁰ V S T
Angles

7. Perpendicular Lines ( )
Perpendicular lines are two lines that intersect to form a right angle S T A B E D C F G

8. Name a pair of adjacent angles and a pair of vertical angles in the figure at the rightK G
145⁰ J I

9. 3. Does every angle have a complement? Explain1. 2. 3 4 3 4
3. Does every angle have a complement? Explain 3. 4 3