Learn the following angle facts:

An ACUTE angle is between 0º and 90º.

A RIGHT angle is exactly 90º.

An OBTUSE angle is between 90º and 180º.

A STRAIGHT LINE angle is exactly 180º.

A REFLEX angle is between 180º and 360º.

There are 180º at angles that meet at a point on a straight line.

There are 360º at angles that meet at a point.

A ¼ turn is 90º.

A ½ turn is 180º.

A ¾ turn is 270º.

A whole turn is 360º.