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Year 5 · Shapes & Geometry

Acute, obtuse and reflex angles

Angles are named by their size compared with a right angle (90°).

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How to do it

  1. Smaller than a right angle: acute.
  2. Exactly a right angle: 90°, shown with a little square.
  3. Bigger than a right angle but less than a straight line: obtuse.

Worked example

An angle of 250°
Bigger than a straight line (180°), smaller than a full turn (360°)
Reflex

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A straight line is 180°.

Practise Acute, obtuse and reflex angles properly

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