GeometryQuestion 430 of 550

Which set of lengths forms the sides of a right triangle?

  1. 5 , 12 , 13
  2. 6 , 7 , 8
  3. 4 , 5 , 6
  4. 7 , 8 , 9
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Correct answer: 5 , 12 , 13

5² + 12² = 25 + 144 = 169 = 13². This follows the Pythagorean theorem.

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Questions last reviewed: 21 October 2026