Let be concentric circles. Circle has a radius of , and the shortest distance from the edge of circle to the edge of circle is . What is the circumference of circle ?

Consider the Circle :

(Figure not drawn to scale.)

Suppose Circle represents a circular pen for Frank's mules. How many meters of fencing does Frank need to build this pen?

A circle on the coordinate plane has equation

What is its circumference?

Megan, a civil engineer, is designing a roundabout for the city of Madison. She knows that the distance from the edge of the roundabout to the center must be 25 meters. Help Megan find the circumference of the roundabout.

A circle has radius . Give its circumference.

If the radius of a circle is , what is its circumference?

A circle on the coordinate plane has equation

Which of the following represents its circumference?

A circle on the coordinate plane has equation .

What is its circumference?

On average, Stephanie walks feet every seconds. If Stephanie walks at her usual pace, how long will it take her to walk around a circular track with a radius of feet, in seconds?