Question

Given the formula for the circumference of a circle, C=2πr , how would you rearrange the formula if you were interested in finding the radius of the circle?
A) r = C/π
B) r = 2πC
C) r = C/2π
D) r = Cπ/2

Answer 1

To find the radius \( r \) of the circle from the formula for circumference \( C = 2\pi r \), you can rearrange the formula as follows:

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

2. Divide both sides by \( 2\pi \) to isolate \( r \):
\[
r = \frac{C}{2\pi}
\]

So, the correct option is:
**C) r = C/2π**.