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Does 1, 2, 5 from a right triangle

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Answer:

no

Explanation:

The two short sides, 1 and 2, do not have a sum greater than the long side, 5, so these lengths do not form any sort of triangle.

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Lengths 1, 2, √5 satisfy the Pythagorean theorem, so will form a right triangle.

1² +2² = (√5)²

1 + 4 = 5 . . . . . . Pythagorean theorem is satisfied

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