What is an angle?

Definition

An angle measures the turn between two lines that meet at a point. It is measured in degrees.

Example

A right angle is 90°, a straight line is 180° and a full turn is 360°.

Tip

Angles in a triangle add up to 180°.

Practise it

• Learn it visually: Angles in a Triangle (interactive lesson)
• Play: Angle Estimator
• Online maths practice

Quick check: try these

Work each one out on paper, then tap the question to see the answer.

1. Find the value of sin 90° + cos 90°.

   Answer: 1

2. A ladder 14 m long leans against a wall and makes an angle of 30° with the ground. The height it reaches on the wall (in m) is

   Answer: 7

3. Find the value of cos 60° + tan 45°.

   Answer: 3/2

4. A ladder 16 m long leans against a wall and makes an angle of 30° with the ground. The height it reaches on the wall (in m) is

   Answer: 8

Learn it in depth

Angle is part of Trigonometry for Class 10: notes, formulas, solved examples with every step, common mistakes and ten practice questions with answers. Want a teacher to go through it with you? See Class 10 maths tuition.

Related words

Right angle, Triangle