Question

pi/2=117.75/r
What is the first step to solve for r, if someone could assist me with that I can handle the rest on my own.

Answer 1

It'd be easier to visualize what you're attempting to do here if you'd write this equation as

pi = 117.7
-- -----
2 r

Next, I'd cross-multiply, then solve the resulting equation for r. Please try it.

Answer 2

OH! now I remember thank you so much I just forgot that first step

Answer 3

it = to 75 it was correct