Classify Angles

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

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

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

How do you classify an angle that measures 45 degrees?

Back

An angle that measures 45 degrees is classified as an acute angle.

Front

How do you classify an angle that measures 120 degrees?

Back

An angle that measures 120 degrees is classified as an obtuse angle.

Front

If two angles are adjacent and their measures add up to 90 degrees, what are they called?

Back

They are called complementary angles.

Front

If two angles are adjacent and their measures add up to 180 degrees, what are they called?

Back

They are called supplementary angles.