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The diameter of a rectangle is the same as its diagonal (angle in a semicircle is a right angle).

So the diagonal forms a right angled triangle with the diagonal as the hypotenuse and two sides of the rectangle (a length and a breadth) forming the legs of the triangle. If the lengths of the sides of the rectangle are known, a simple application of Pythagoras's theorem given the measure of the diagonal.

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15y ago

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Q: How do you work out the diameter of a rectangle?
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