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Congruent Complements Theorem

Suppose angle X is complementary to angle Y. If the measure of angle Y is 40 degrees, what is the measure of angle X?

If angle A is complementary to angle B, and the measure of angle B is 20 degrees, what is the measure of angle A?

If angle P is complementary to angle Q, and the measure of angle P is 30 degrees, what is the measure of angle Q?

Suppose angle M and angle N are complementary. According to the Complementary Angles Theorem, what is true about the measures of angles M and N?