(Solved): The circumference C of a circle is a function of its radius by C(r)=2r. Express the radius of a c ...

The circumference $C$ of a circle is a function of its radius by $C(r)=2\pi r$. Express the radius of a circle as a function of its circumference. Call this function $r(C)$. $r(C)=$ Find $r(14\pi )$. $r(14\pi )=$ Interpret the meaning. When the circumference is $14\pi$, the radius is $r(14\pi )$. When the radius is $14\pi$, the circumference is $r(14\pi )$.