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Year 5 · Shapes & Geometry

Estimate angles

Estimate angles by comparing with ones you know: 90° is a square corner, 180° a straight line, 360° a full turn.

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How to do it

  1. Is it less or more than a right angle?
  2. Is it about half a right angle (45°) or nearly straight (close to 180°)?
  3. Choose the closest number.

Worked example

Estimate this angle
More than 90°, less than 180°
About 120°

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Watch out
A reflex angle is bigger than 180°.

Practise Estimate angles properly

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