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Year 8 maths · U.1 · Area of plane figures

Area of a triangle

Area of a triangle = ½ × base × height.

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  1. A triangle has a base of 10 cm and a height of 20 cm. What is its area in cm²?

    Answer: 100

  2. A triangle has a base of 9 cm and a height of 20 cm. What is its area in cm²?

    Answer: 90

  3. A triangle has a base of 11 cm and a height of 6 cm. What is its area in cm²?

    Answer: 33

Tip: Area of a triangle = ½ × base × height.

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