1. Angle Relationships Lesson Objective Discover relationships between special pair of angles. Vocabulary. Adjacent angles, linear pair angles, vertical angles

2. Adjacent angles are two angles that lie in the same plane, have a common vertex, and a common side, but no common interior points. A C B D A C B D A C B D Examples No example 

3. A Linear pair is a pair of adjacent angles whose noncommon sides are opposite ray A C B D Example No example A C B D B,D, and C are no collinear 

4. Vertical angles are angles opposite to one another at the intersection of two lines. (vertical angles are congruent) E C B D A C B D ExamplesNo example A  Geogebra

5. Supplementary angles: Two angles that add up to 180° A C B ∠ BDA and ∠ ADC are supplementary A B D ∠ A and ∠ B are supplementary 

6. Complementary angles: Two angles that add up to 90° Z R P Q 2 ∠ 1 and ∠ 2 are complementary ∠ PQR and ∠ XYZ are complementary Y X 1 

7. The little symbol ("corner") is used to indicate a right angle. is read perpendicular to C B D A  Perpendicular lines meet to form right angles