If a penny has a circumference of 59.69millimeters, what is the radius of a penny?

Answer: Circumference = 2 * pi * radius. So we just plug in our given information and solve for the missing variable.

59.69 = 2r

Divide both sides by to isolate the variable r.

r = 59.69 /

Put that into the calculator

r ≈ 93.7608 mm