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Use the Pythagorean Theorem:

c2 = a2 + b2

c2 = 72 + 52

c2 = 49 + 25

c2 = 74

c = square root of 74 = about 8.6

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Q: The legs of a right triang are 7 and 5 centimeters long respecively the length of the hypotenuse?
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