the radius of a circle when the numeric values of the circumference and the area are equal
Start with what you know. If you know the formula the area of a circle, and the formula for the circumference of a circle, then you can set them equal to each other...from there you should be able to get the radius!!
set A = pi * r^2 and C= 2*pi*r to eual each otherso u get pi*r^2 = 2*pi*r the pi's cancles and the the r^2 is reduced whuch gives r = 2