**ANGLES**

An **acute **angle is less than 90º

A **right angle** is 90º

An **obtuse **angle is between 90º and 180º

A **straight **line angle is 180º

A **reflex **angle is between 180º and 360º

**TRIANGLES**

A **right-angled **triangle has one 90º angle

An **isosceles **triangle has two equal angles

An **equilateral **triangle has three equal angles, each of size 60º

A **scalene **triangle has three different angles