SOLUTION: in radical form what is the length of a diagonal of a sqaure if the perimeter is 20

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The diagonal of a square defines two congruent right triangles.
The diagonal is the hypotenuse.
The Pythagorean Theorem teaches us:
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With a square, a=b so we have
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We are told perimeter = 20, which for a square = 4*a
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Substitute a=5
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Check this proposed answer to make sure it is correct.
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??
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Correct.