1. Angle Relationships
Lesson 1.5

2. Adjacent angles – angles next to each other
that share a side and a vertex. A D B C
2. Vertical angles – non-adjacent angles formed by two intersecting lines.

3. 3. Linear Pair – two angles that form a line
3. Linear Pair – two angles that form a line. They are adjacent and are formed by opposite rays.
<2
<1
4. Complementary Angles – two angles whose measure sum to 90 degrees. May or may not be adjacent. 20 70

4. 6. Perpendicular – Lines that intersect to form right angles.
5. Supplementary Angles – two angles whose measure sum to 180. May or may not be adjacent. 30
150
6. Perpendicular – Lines that intersect to form right angles.