Question

Question #b5f55

Answer 1

Assuming you mean `c = 2pir` then solving for `r` gives `r = c/(2pi)`

See full explanation below.

Explanation:

Given `c = 2pir` we can solve for `r` by dividing each side of the equation by `color(red)(2pi)`

`c/color(red)(2pi) = (2pir)/color(red)(2pi)`

`c/color(red)(2pi) = (color(red)(cancel(color(black)(2pi)))r)/cancel(color(red)(2pi))`

`c/color(red)(2pi) = r`

`r = c/color(red)(2pi)`