## Introductory Algebra for College Students (7th Edition)

r=$\frac{C}{2\pi}$ Circumference formula
C=2$\pi$r 2$\pi$r=C $\frac{2\pi r}{2\pi}$=$\frac{C}{2\pi}$ r=$\frac{C}{2\pi}$ The given is the circumference formula which means that circumference is equal to the product of 2, pi, and the radius.