Question

question 7 of 10 what is the formula that relates circumference and radius? a. c + 2 = 2πr b. c = 2π/r c. c = 2πdr d. c = 2πr

Explanation:

The formula for the circumference $C$ of a circle in terms of its radius $r$ is based on the definition of $\pi$. $\pi$ is the ratio of the circumference of a circle to its diameter $d$ ($\pi=\frac{C}{d}$), and since $d = 2r$, we get $C=2\pi r$.

Answer:

D. $C = 2\pi r$