We’re updating Ivy Maths.We apologise for any bugs while we make improvements. Thanks for your patience.
All topics
Year 6
Angles
Definition
An angle measures an amount of turn between two lines, in degrees. Angle facts, like angles on a straight line adding to 180°, let you work out missing angles without measuring.
Why Do I Have to Learn This?
Angles measure turn, from door hinges to skate ramps. Reading them helps you build, draw and navigate accurately.
Key Rules:
- 1. A full turn is 360°, a straight line is 180°, a right angle is 90°.
- 2. Angles around a point add to 360°; angles in a triangle add to 180°.
- 3. Vertically opposite angles are equal; parallel lines create equal alternate and corresponding angles.
Remember:
- •Common slip: measuring from the wrong zero on the protractor, start from the line.
- •Acute is smaller than 90°, obtuse is between 90° and 180°, reflex is bigger than 180°.
- •Always give a reason with the angle in written answers ("angles on a straight line").
Acute angle
An angle smaller than 90 degrees.
An angle of 45° is acute.
Animated Example:
3 sides: angles add to 180°
Free Angles Worksheet
Download free worksheets and practise today.
Every download has a fresh set of questions.
Let’s Practise the Concept
Step 1 of 3
Put the angles in order
Tap them from smallest to largest.
In order so far: nothing yet