Question 980423

 {{{Circumference=4pi}}}

since circumference is {{{2rpi}}}, we have

{{{2rpi=4pi}}}

{{{r=4pi/2pi}}}

{{{r=2}}}

so, the area of the circle will be {{{A=r^2pi}}}=>{{{A=2^2pi}}}=>{{{A=4pi}}}