The formula for the circumference of a circle is \(C=2 \pi r\).
Plug in the given circumference and solve for the radius.
\(C=2 \pi r\)
\(20=2 \pi r\)
\(10= \pi r\)
Use 3.14 as an approximate value for π and divide to solve. Round to the nearest tenth. r = 3.2