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Circumference
Definition of Circumference

• 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 = = 3.141.
• Another name for circumference is perimeter.

Example of Circumference

• The circumference of the given circle is shown in red.

Solved Example on Circumference

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 = .
Step 3: Radius = r = 14 cm [From the figure.]
Step 4: Circumference = 2 × × 14 [Substitute 14 for radius and for π.]
Step 5: = 2 × 22 × 2
Step 6: = 88 [Multiply.]
Step 7: The circumference of the circle is 88 cm.

Related Terms for Circumference

• Circle
• Closed Curve
• Diameter
• Distance
• Perimeter
• Radius

Additional Links for Circumference

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