7th Grade · Geometry
Supplementary
7.G.B.5
Definition
Two angles whose measures sum to 180°. Each is the supplement of the other. Can be adjacent or non-adjacent.
Examples
- 50° and 130° sum to 180° — supplementary.
- Supplement of 65° = 180° - 65° = 115°.
Key rule
Complementary sums to 90° (corner); supplementary sums to 180° (straight line).
Memory hook
Two angles making a straight line.