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Year 9 maths · M.5 · Pythagorean theorem

Find a leg: round to the nearest tenth

Use a² + b² = c² and solve for the missing leg: subtract the known leg squared from the hypotenuse squared.

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  1. A right triangle has a hypotenuse of 19 m and one leg of 8 m. How long is the other leg, in m? Round to the nearest tenth.

    Answer: 17.2

  2. A right triangle has a hypotenuse of 20 m and one leg of 3 m. How long is the other leg, in m? Round to the nearest tenth.

    Answer: 19.8

  3. A right triangle has a hypotenuse of 17 cm and one leg of 13 cm. How long is the other leg, in cm? Round to the nearest tenth.

    Answer: 11

Tip: Use a² + b² = c² and solve for the missing leg: subtract the known leg squared from the hypotenuse squared.

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