Math CentralQuandaries & Queries


Question from kim, a student:

how do you figure the perimeter of a quarter circle that has a radius of 7 inches? I would like to have the explanation of how you figure it out. Thank you

Hi Kim,

The perimeter of a quarter is made up of 3 parts.

quarter circle

The first part is of length one-quarter of the perimeter (circumference) of the circle.

What is the length of one-quarter the circumference of a circle of radius 7 inches?

Parts 2 and 3 are each a radius of the circle.

What is the sum of the lengths of the three parts?


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