If a right triangle has legs 9 and 12 inches long. What is the hypotenuse?
The length of the hypotenuse will be 15 units. The rule is that the sum of the squares of the two sides will equal the square of the hypotenuse. The sides are 9 and 12, and the squares are 81 and 144 respectively. They sum to 225, and that's the square of the hypotenuse. The square root of 225 is 15, and that's the number of units that is the length of the hypotenuse.
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