Complementary and Supplementary Angles

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

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

Back

60 degrees.

Front

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

Back

60 degrees.

Front

How do you find the missing angle in a complementary pair?

Back

Subtract the known angle from 90 degrees.

Front

How do you find the missing angle in a supplementary pair?

Back

Subtract the known angle from 180 degrees.

Front

What is the sum of the angles in a triangle?

Back

180 degrees.