What is the radius of the circle, in feet? 03/25/2021 – by Mod_GuideK 0 A circle has a circumference of 16p feet. What is the radius of the circle, in feet? A. 8 is the correct answer. The formula for the circumference of a circle with radius r is 2πr. So 2πr = 16, or r = 8. [/showhide] Download Printable PDF. VALID exam to help you PASS.