An isosceles right triangle has legs that are 10 inches long how long is the hypotenuse

Each leg is 10 in, and since a squared+b squared=c squared, then it's 10 squared+10 squared=c squared. c is the hypotenuse. 100+100=200, so then the square root of 200 is the hypotenuse. The square root of 200 is approximately 14.1421356237

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