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Use Pythagoras. The diagonal, and two sides of the square form a right angled triangle. So if each side of the square is x cm long, the diagonal is x*sqrt(2) cm long.

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Q: How do you find out the length of a diagonal in a square?
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How do you find the side of a square if you know its diagonal?

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How do you find the length of a rectangle knowing ONLY the diagonal and the width?

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