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 is less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that is greater than 90 degrees but less than 180 degrees.

Front

What is a right angle?

Back

An angle that is exactly 90 degrees.

Front

What is a straight angle?

Back

An angle that is exactly 180 degrees.

Front

If angle A is 30 degrees, what is the measure of its complementary angle?

Back

60 degrees.

Front

If angle B is 120 degrees, what is the measure of its supplementary angle?

Back

60 degrees.

Front

What do you call two angles that share a common vertex and a common side?

Back

Adjacent angles.

Front

What do you call angles that are opposite each other when two lines intersect?

Back

Vertical angles.