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By the Pythagorean Theorem, the diagonal is the hypotenuse of the right triangle formed by the diagonal and the two included sides.

c2 = a2 + b2 so the diagonal is the square root of the sum of the squares of the rectangle's length and width.

Example : for a rectangle 4 x 3, the diagonal is sqrt(32 + 42) = sqrt (25) = 5

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13y ago

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Q: How do you find the diagonal of a rectangle?
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