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Year 6 · Shapes & Geometry

Missing angle in a triangle

Angles in a triangle add to 180°. Angles on a straight line add to 180°. Angles around a point add to 360°.

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How to do it

  1. Decide which total applies.
  2. Add the angles you know.
  3. Subtract from the total.

Worked example

A triangle with 60° and 70°
60 + 70 = 130
180 − 130 = 50°

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Watch out
A triangle is 180°, not 360°.

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