The complete distance around a circle or a closed curve is called its Circumference.

More About Circumference

The formula for the circumference of a circle, C = 2 × π × r = π × d, where `r` is the radius and `d` is the diameter of the circle.π =22/7 = 3.141.
Another name for circumference is perimeter.

Video Examples: Circumference of a Circle

Example of Circumference

The circumference of the given circle is shown in red.

Solved Example onCircumference

Ques: Find the circumference of the circle.

Choices:

A. 8 cm
B. 88 cm
C. 4 cm
D. 44 cm
Correct Answer: B

Solution:

Step 1: The distance around the circle is called its circumference.
Step 2: Circumference of a circle = 2πr, where r is the radius of the circle and π = 22/7.
Step 3: Radius = r = 14 cm [From the figure.]
Step 4: Circumference = 2 × 22/7 × 14 [Substitute 14 for radius and22/7 for π.]
Step 5: = 2 × 22 × 2
Step 6: = 88 [Multiply.]
Step 7: The circumference of the circle is 88 cm.