You are making cone-shaped hats for a drama production. The pattern calls for circles with a 20-inch diameter. You are to cut out a sector created by a 60° angle, as shown in the figure.
What is the circumference, in inches, of the circular base of the conical hat? Round to the 𝐍𝐄𝐀𝐑𝐄𝐒𝐓 𝐓𝐄𝐍𝐓𝐇 *