SEARCH HOME
 Math Central Quandaries & Queries
 Question from SteVonee, a student: Estimate the radius of a circle with the given circumference that is 192ft

Hi SteVonee,

The circumference of a circle is given by

circumference = 2 π r

where r is the radius and π is approximately 3.1416. Thus you have

192 = 2 × 3.1416 × r = 6.2832 × r

What is r?

Penny

Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.