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To find the perimeter of a rectangle we need to know the length of its sides.

P = 2L + 2W

Let L = 8, and W = √(102 - 82) = √(100 - 64) = √36 = 6 (by the Pythagorean theorem, where the hypotenuse is the diagonal and legs are the sides of the rectangle).

Thus,

P = 2(8) + 2(6) = 16 + 12 = 28.

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Q: What is perimeter of a rectangle with a side of 8 and diagonal of 10?
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