Question

HELP NEEDED PLEASE
The formula for the circumference C of a circle with radius r is C = 2πr. Which of the following is a formula for π (pi) of the circle in terms of the circumference and radius?

pi equals C plus two r

pi equals C minus two r

pi equals two r all over C

pi equals C over two r

Answer 1

C = 2πr
rearranging:
C = π2r
divide all through by 2r, what do you get?

Answer 2

you mean 2r mult to pie?

Answer 3

I mean :
c/2r = π2r/2r

Answer 4

still confused....mhmm hold on

Answer 5

Look at the right side of the equation that gitahimart posted and see what cancels.