To find the circumference of a circle you use the formula C=pi*(radius*radius). If you know that the cuircumference is 6 pi, you first plug that in to solve for the radius. 6pi=pi*(r*r) 6pi/pi=(r*r) Square root of(6pi/pi)=r 2.45=r Then to find the area you use the formula A=pi*(r*r) which is A=Pi*(2.45*2.45) A=6pi or 18.85