Finding Missing Angles

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

If two angles add up to 90 degrees, what are they called?

Back

They are called complementary angles.

Front

What is the measure of angle x if it is complementary to a 75 degree angle?

Back

Angle x measures 15 degrees.

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.

Front

If one angle in a triangle measures 60 degrees and another measures 90 degrees, what is the measure of the third angle?

Back

The third angle measures 30 degrees.

Front

What do you call angles that add up to 180 degrees?

Back

They are called supplementary angles.

Front

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

Back

The supplementary angle measures 60 degrees.

Front

What is the measure of angle FCA if it is given as 23 degrees?

Back

Angle FCA measures 23 degrees.

Front

What is the measurement of a straight angle?

Back

A straight angle measures 180 degrees.

Front

If angle A measures 40 degrees, what is the measure of angle B if they are supplementary?

Back

Angle B measures 140 degrees.