the radius of a circle when the numeric values of the circumference and the area are equal?
October-A month of math
- billrussell42Lv 71 decade agoFavorite Answer
A = πr² = C = πd = 2πr
πr² = 2πr
r² = 2r
r = 2
- 1 decade ago
2(pi)r = (pi)r^2 cancel out pi
2r=r^2 what number for r would make these equal to eachother?
There is only one number that is the same squared as it is when multiplied by 2, and that is 2 since 2 times itself is the same as 2 times 2.
The radius is 2.