Question

The formula for the circumference of a circle is C = 2nr, where is the radius. Rearrange the formula to solve for r and select the correct option below.

r = 2/n pie
r= 2nc r= c-2n r=2pie/c

Answer 1

`\boxed {\boxed {\sf r=(c)/(2\pi) }}`

Explanation:

The formula for the circumference is:

`c=2\pi r`

To solve for r, we must isolate r on one side of the equation by performing the inverse operation.

r is being multiplied by 2π. The inverse of multiplication is division. Divide both sides of the equation by 2π

`(c)/(2\pi) =(2 \pi r )/(2 \ pi)`

`(c)/(2\pi) =r`

The circumference formula solved for r is c/2π