Math CentralQuandaries & Queries


Question from sierra, a student:

how do you figure the perimeter of a quarter circle that has a radius of 12

Hi Sierra,

The perimeter (sometimes called the circumference) of a circle is $2 \times \pi \times r$ where $r$ is the radius and $\pi$ is approximately $3.1416.$ The perimeter of a quarter circle is composed of three parts, the curved part which has a length of one-quarter the perimeter of the circle and two straight parts, each of length $r.$


The length of the perimeter of the quarter circle is the sum of the lengths of the three parts.


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