Types of Angles

Front

What is a right angle?

Back

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

Front

What is an acute angle?

Back

An acute angle is an angle that measures greater than 0 degrees but less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures greater 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

Which angle measures exactly 90 degrees?

Back

A right angle.

Front

Which angle measures less than 90 degrees?

Back

An acute angle.

Front

Which angle measures more than 90 degrees?

Back

An obtuse angle.

Front

What do you call an angle that is exactly 180 degrees?

Back

A straight angle.

Front

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

Back

Complementary angles.

Front

If two angles add up to 180 degrees, what are they called?

Back

Supplementary angles.