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EXAMPLE 4 SOLUTION Method 1: Use a Pythagorean triple. A common Pythagorean triple is 5, 12, 13. Notice that if you multiply the lengths of the legs of the Pythagorean triple by 2, you get the lengths of the legs of this triangle: 5 2 = 10 and 12 2 = 24. So, the length of the hypotenuse is 13 2 = 26. Find the length of a hypotenuse using two methods Find the length of the hypotenuse of the right triangle.

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EXAMPLE 4 Find the length of a hypotenuse using two methods SOLUTION Method 2: Use the Pythagorean Theorem. x 2 = 10 2 + 24 2 x 2 = 100 + 576 x 2 = 676 x = 26 Pythagorean Theorem Multiply. Add. Find the positive square root.

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GUIDED PRACTICE for Example 4 Find the unknown side length of the right triangle using the Pythagorean Theorem. Then use a Pythagorean triple. 7. ANSWER 15 in. 8. ANSWER 50 cm.

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