How Should You Find the Circumference of a Circle?

The circumference of a circle is the distance around the outskirts of the circle. Knowing the radius of any circle allows one to calculate its circumference.

  1. Find the radius of the circle

    The radius extends from the center of a circle to its outer edge. To find the radius of a circle, locate its center. Then, measure the distance from the center to the outer edge of the circle. This distance is the radius.

  2. Recall the circumference formula

    The circumference of a circle is two times pi times the radius. Algebraically, C = 2 x pi x r, where "C" is the circumference, "pi" is 3.14159 and "r" is the radius.

  3. Perform the necessary calculations

    For a circle with a radius of 4 meters, the circumference is given by 2 x 3.14 x 4 meters, which equals 25.12 meters.