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:
\(r = 2.4\)
