Question

The formula for the circumference of a circle is C = 2πr, where r is the radius. Rearrange the formula to solve for r and select the correct option below. . . .
1.) r = C over 2 pi.
2.) r = 2πC.
3.) r = C − 2π.
4.) r = 2 pi over C

Answer 1

The circumference of a circle is:
C = 2 π r   /: 2 π  ( we will divide both sides of an equation by 2 π )
C / 2π = r
Answer: 1) r = C over 2 pi

Answer 2

Answer: 1) r = C over 2 pi