Angle Names

Angle Names

Basic, GCSE(F),

Angles measure the amount of turn, or change of direction.

Angles are measured in degrees. A number that is a degree has a small º immediately after the number: 153º means 153 degrees. There are 360º in a complete turn. Half a turn is 180º, and a quarter turn is 90º.

In geometry, angles are seen when two lines join at a point.

Angles have names, depending on the amount of turn in the angle.


1. Four angles of the same type make up the inside angles of a square. What is the name of that type of angle?

Answer: A Right Angle

A square consists of 4 equal angles. Each angle is 90º. An angle of 90º is known as a right angle.

2. I have an angle of 88º. What type of angle, or angles, could it be?

a) Acute Angle b) Span Angle c) Right Angle d) Square Angle

Answer: a) Acute Angle

An Acute Angles is greater than 0º and less than 90º.