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 $2\pi$.
$C\div(2\pi)=2\pi r\div(2\pi)$

Step2: Simplify the equation

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

Answer:

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