Circumference is the total length of the outer boundary of a circle. It can also be referred to as the perimeter of the circle. It is the product of the diameter and constant pi. You can get the circumference of a circle in units like centimeters, meters, kilometers, and so on. The circumference of a circle can be calculated by knowing either the radius or diameter of the circle.
Here is an example to solve the problem of working backward with the circumference. Let’s look at the given example mentioned below to understand more about the concept.
Circumference of a Circle = 2 Πr Where, r = radius of the circle. Π = pi i.e. constant. |
Q. Find the radius of the circle whose circumference is 157 units.
Step 1: Note the value of the circumference of a circle.
Circumference of the circle = 157 units.
Step 2: Use the circumference formula to identify the radius of the circle.
So,
Circumference of a circle = 2 Πr
157 = 2 * 3.14 * r
157 = 6.28 * r
R = 157 / 6.28 = 25 cm.
Hence, the radius of the circle is 25 cm.
You can download and print this super fun working backward with circumference worksheets from here for your students.
