.18 Rearrange multi-variable equations

Question

WSJ
Solve for r in terms of C.
C=2​𝜋r
r=

Answer 1

To solve for \( r \) in terms of \( C \) from the equation \( C = 2\pi r \), follow these steps:

1. Start with the equation: \[ C = 2\pi r \]

2. To isolate \( r \), divide both sides of the equation by \( 2\pi \): \[ r = \frac{C}{2\pi} \]

Thus, the solution for \( r \) in terms of \( C \) is: \[ r = \frac{C}{2\pi} \]