We know that the area of the circle is given as the following function:
A = (r^2)*pi where r is the radius.
But we know that:
C = 2r ( c is the circumference)
==> r = C/2
Now substitute with r = C/2
==> A = (c/2)^2 *pi
= C^2 / 4)*pi
= (C^2)*pi /4
A = (c^2)*pi/4
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