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A triangle is right triangle if square of the longest side is equal to sum of squares of other two sides.

Square of 24 = 576

Sum of square of 9 and 21 = 92 + 212 = 81 + 441 = 522

576 ≠ 522.

It is clear that triangle is not a right triangle.

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Q: Does a triangle with the side lengths 9 24 21 make right triangle?
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