Find the area of a circle given C = 4π. Give your answer in terms of π.
The formula for the circumference of a circle is C = 2πr, where r is the radius of the circle. In this case, C = 4π, so 4π = 2πr. Solving for r, we get:
4π = 2πr
r = 2
The formula for the area of a circle is A = πr^2, so plugging in r = 2, we get:
A = π(2)^2
A = π(4)
A = 4π
Therefore, the area of the circle is 4π.