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Grade 10 maths · A.7 · Triangles

Decide whether sides make a right triangle

Check whether the squares of the two short sides add to the square of the longest.

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  1. Do the side lengths 10, 24 and 26 make a right triangle? Answer yes or no.

    Answer: yes

  2. Do the side lengths 5, 12 and 15 make a right triangle? Answer yes or no.

    Answer: no

  3. Do the side lengths 5, 12 and 12 make a right triangle? Answer yes or no.

    Answer: no

Tip: Check whether the squares of the two short sides add to the square of the longest.

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