Identifying Angles

Acute, Right, Obtuse

An acute angle measures less than 90 degrees, but more than 0 degrees.

It is smaller than a right angle.


A right angle measures exactly 90 degrees.


An obtuse angle measures more than 90 degrees, but less than 180 degrees.

It is bigger than a right angle.

A straight angle makes a line and measures exactly 180 degrees.


A reflex angle measures more than 180 degrees.

It is bigger than a straight angle.