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Year 6 · Measurement

Area of a triangle

Area of a triangle is half base × height. A parallelogram is base × height.

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How to do it

  1. Find the base and the height (the height is at right angles to the base).
  2. Triangle: multiply and halve. Parallelogram: just multiply.

Worked example

Triangle, base 8, height 5
8 × 5 = 40
40 ÷ 2 = 20 cm²

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Watch out
Use the perpendicular height, not a slanted side.

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