You should know 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