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Still use the Pythagorean theorem.

C2 + a2 + b2 ( c = hypotenuse )

c2 = 52 + [sqrt(2)]2

c = sqrt( 25 + 2)

c = sqrt(27)

================your hypotenuse in am exact answer.

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Q: What is the hypotenuse if the two legs are 5 root 2?
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