Classifying Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex).

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle whose measure is less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle whose measure is greater than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

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 measures 70 degrees, what is the measure of its complementary angle?

Back

20 degrees.

Front

If two angles are supplementary and one measures 156 degrees, what is the measure of the other angle?

Back

24 degrees.

Front

What is the term for angles that are equal in measure?

Back

Congruent angles.