Question

the formula for the circumference of a circle is c = 2πr. use this formula to write a formula for the radius of a circle. a r = 2πc b r = c - 2π c r = \frac{c}{2π} d r = \frac{2π}{c}

Explanation:

Step1: Isolate the radius r.

Given $C = 2\pi r$, divide both sides by $2\pi$.
$\frac{C}{2\pi}=\frac{2\pi r}{2\pi}$

Step2: Simplify the right - hand side.

$\frac{2\pi r}{2\pi}=r$, so $r=\frac{C}{2\pi}$

Answer:

C. $r = \frac{C}{2\pi}$