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Year 4 · Shapes & Geometry

Types of 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 115°
Bigger than 90°, smaller than 180°
Obtuse

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A straight line is 180°.

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