Question

The radius of a circular clock face is 13 centimeters. how do i find the circumfrence

Answer 1

The formula is 2pi(radius) so 13*2*pi=26pi

Answer 2

so there are two formulas C= $\pi$d and C=2$\pi$r
we are going to use C=2 pi r
so since the radius is 13 we do 13×2×3.14, which equals to 81.64
So the circumference is 81.64 centimeters.