Question

If a circle has a circumference of C, what is the area of the circle in terms of C? A. A=πC

B. A=C24π

C. A=2Cπ

D. A=2C2

Answer 1

The area of the circle is expressed in the formula A = pi r^2 while the formula of getting the circumference of the circle is C = 2pi *r. Trying to express A in terms of C, we square C first into C2 = 4pi^2r^2.  In this case, the answer to this problem therefore is A = C^2/4 pi. Answer is B