Complementary or Supplementary Angles

Two angles are complementary if the sum of their angles equals 90^o.
If one angle is known, its complementary angle can be found by subtracting the measure of its angle from 90^o.

Example: What is the complementary angle of 43^o?
Solution: 90^o - 43^o = 47^o
Two angles are supplementary if the sum of their angles equals 180^o.
If one angle is known, its supplementary angle can be found by subtracting the measure of its angle from 180^o.
Example: What is the supplementary angle of 143^o?
Solution: 180^o - 143^o = 37^o

Are the Angles Complementary, Supplementary or Neither?

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