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First Year maths · U.6 · Area of plane figures

Find the height of a triangle from its area

Work backwards from the area formula to find the missing length.

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  1. A triangle has an area of 120 cm² and a base of 16 cm. What is its height in cm?

    Answer: 15

  2. A triangle has an area of 65 cm² and a base of 10 cm. What is its height in cm?

    Answer: 13

  3. A triangle has an area of 70 cm² and a base of 20 cm. What is its height in cm?

    Answer: 7

Tip: Work backwards from the area formula to find the missing length.

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