The circumference formula of a circle is obtained by multiplying the diameter by pi(π). To recall, the circumference of a closed curve or circular object is the distance around its edge. The circumference of a circle has special importance in geometry and trigonometry.
Formula to Calculate Circumference of a Circle
Formula to Find Circumference
The Circumference Formula requires either the radius or the diameter of the circle for its calculation.
| Circumference of a Circle | C = 2πr = πd |
Where,
- C is the circumference of the circle.
- d is the diameter of the circle.
- r is the radius of the circle.
Circumference Formula in Terms of Area
| C = 2√(πA) |
Solved Examples
Question: The radius of a circle is 2 inches. What is the circumference of the circle?
Solution:
Given,
Radius of the circle = r = 2 inches
Circumference of the circle = 2πr = 2 × π × 2 inches = 12.57 inches
Nice