Complementary and Supplementary Angles

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

If one angle is 30 degrees, what is its complementary angle?

Back

60 degrees (90 - 30 = 60).

Front

If one angle is 120 degrees, what is its supplementary angle?

Back

60 degrees (180 - 120 = 60).

Front

Find x if x + 40 = 90.

Back

50 (x = 90 - 40).

Front

Find x if x + 70 = 180.

Back

110 (x = 180 - 70).

Front

What is the measure of an angle that is complementary to a 45-degree angle?

Back

45 degrees (90 - 45 = 45).

Front

What is the measure of an angle that is supplementary to a 90-degree angle?

Back

90 degrees (180 - 90 = 90).

Front

If two angles are complementary and one angle measures 25 degrees, what is the other angle?

Back

65 degrees (90 - 25 = 65).

Front

If two angles are supplementary and one angle measures 150 degrees, what is the other angle?

Back

30 degrees (180 - 150 = 30).