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V(4) = 4/3, 64, pi
If a circle has radius r, then the area of the circle is pi r2, pi being about 3.14159. I beleive the function you are looking for is A(c)=c/2*r
C = 2 x R x pi
Yes.You could also state that the circumference is directly proportional to the radius. The proportionality constant is (2 pi).
Quite simply the circumference is always 2 x pi times the radius. As a result, the slope is also 2 x pi.