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Question

Determine if the following lengths are Pythagorean triples: 9,40 and 41.

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Solution

The longest side of the triangle is called hypotenuse. According to the Pythagorean theorem the square of the hypotenuse is equal to the sum of the square of the two other sides.
412=402+92
402+92=1600+81=1681
412=1681
1681=1681
Hence these length are Pythagorean triples.

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