Two angle pairs that come up everywhere.
Drag the ray
35°
acute angle
complement = 55°
Drag the ray
110°
obtuse angle
supplement = 70°
The pair rules
- Complementary — two angles summing to 90°.
- Supplementary — two angles summing to 180°.
Try it
Complement of 35°
90° − 35° = 55°.
Try it
Supplement of 110°
180° − 110° = 70°.