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Year 9 maths · M.2 · Pythagorean theorem

Find a leg of a right triangle

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 58 m and one leg of 42 m. How long is the other leg, in m?

    Answer: 40

  2. A right triangle has a hypotenuse of 10 cm and one leg of 6 cm. How long is the other leg, in cm?

    Answer: 8

  3. A right triangle has a hypotenuse of 58 cm and one leg of 40 cm. How long is the other leg, in cm?

    Answer: 42

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

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