Question

What is the area of of a circle with the circumference of 6.28

Answer 1

Circumference = $2 \pi r$
6.28 = $2 \pi r$
r = 1

Area = $\pi r^2$
Area = $\pi (1)$
Area = 3.14

Hope that helps :)

Answer 2

Area of a circle = $\pi r^{2}$
Circumference of a circle = $2 \pi r$ or $\pi d$

Circumference = $\pi d$ = 6.28
d = 2
r = 1

Area = $\pi (1)^{2}$ = 3.14