The relationship between the area A of a circle and its circumference C is given by the formula A = kC2，where k is a constant. What is the value of k ?
A.1(4π)
B.1(2π)
C.14
D.2π
E.4π2
我的答案：
The relationship between the area A of a circle and its circumference C is given by the formula A = fff\(kC^2\)/fff，where k is a constant. What is the value of k ?
