two angles are called complementary angles if they add up to 90 degrees, right?

then what about 110 and -20? are they complementary? or complementary angles have to be both positive?

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- Jul 16th 2010, 06:18 AMKat-Mcomplementary angles
two angles are called complementary angles if they add up to 90 degrees, right?

then what about 110 and -20? are they complementary? or complementary angles have to be both positive? - Jul 16th 2010, 06:24 AMProve It
When dealing with complementary angles, it's actually their magnitudes (sizes) that have to add to $\displaystyle 90^\circ$.

- Jul 16th 2010, 06:27 AMKat-M
- Jul 16th 2010, 06:27 PMProve It
Yes. If you were to draw both on the unit circle, you would have a $\displaystyle 90^{\circ}$ angle.