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If you mean the hypotenuse of a right angle triangle with sides of 15 cm then use Pythagoras: theorem of:-

152+152 = 450 and the square root of this is length of the hypotenuse which is 15 times the square root of 2 or about 21.213 cm to three decimal places

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Q: How do you solve the hypotenous when x is 15 cm and y is 15 cm?
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