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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Add up all the sides of the rectangle.
There are two of them.
Radius of a circle = diameter/2
Divide the area by Pi to get the diameter.
It is called a diagonal and goes from any vertex to the next-but-one vertex.