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A rectangle does not have a diameter, as such, but the diagonal is similar enough. If the sides of a rectangle are x cm and y cm then, using Pythagoras's theorem, the diagonal is sqrt(x2 + y2) cm.

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Q: How do you calculate the diameter of a rectangle?
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Where is the width and diameter of a rectangle?

A rectangle is an elongated square. It doesn't have a diameter; only circles have diameters.


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