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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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Q: How do you work out 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.


How do you calculate the diameter of a rectangle?

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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A rectangle does not have a diameter, only circles or similar obects have diameters. A rectangle has a diagonal which is obtained by joining two opposite corners. Any two adjacent sides of the rectangle together with the diagonal form a right angled triangle and so the length of the diagonal can be derived using Pythagoras's theorem.


Does a rectangle have diameter?

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