Question

Solve C = 2πr (solve for "r") C = 15

Answer 1

C = 2 pi r

but c = 15

15 = 2 pi r
15 = 2 * (22/7) * r
r = (15*7) / 2 / 22
r = 2.386

Answer 2

For this case we have the following equation:

$C = 2\pir$

From here, we clear the value of r:

$r = \frac{C}{2\pi}$

Substituting the values in the obtained equation we have:

$r = \frac{15}{2\pi}$

Doing the calculations we have:

$r = 2.4$

Answer:

The value of r is given by:

$r = 2.4$