It is called a diagonal and goes from any vertex to the next-but-one vertex.
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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.
The area of the circle is 50.265482457436691815402294132472 inches2. The area of the rectangle is 210 inches2. The rectangle is larger in area by 159.73451754256330818459770586753 inches2,
t2 ÷ (2( π + 4) π = pi
Rectangle area = (rectangle width) x (rectangle height)
A = lw Area of a rectangle = length times width