Types of Angles

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 greater than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

How do you find the measure of a missing angle in a triangle?

Back

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

Front

If one angle measures 90 degrees and another measures 45 degrees, what is the measure of the third angle?

Back

The third angle measures 45 degrees.

Front

What is the relationship between complementary angles?

Back

Two angles are complementary if their measures add up to 90 degrees.

Front

What is the relationship between supplementary angles?

Back

Two angles are supplementary if their measures add up to 180 degrees.

Front

What type of angle is formed by two rays that point in exactly opposite directions?

Back

A straight angle.

Front

What is the measure of an angle that is complementary to a 30-degree angle?

Back

60 degrees.