Circumference of circle is the perimeter of the circle. Circumference of a circle can be calculated by the formula, C= 2 * pie * radius. Here pie is a constant whose value is numerically equal to (22/7). This formula can be derived from the formula of Area of a circle. Circumference of a circle can also be calculated using the formula, C= (4 * Area of circle)/diameter of the circle. I will help you find circumference of a circle with an example.

- Consider a circle of radius 10 cm and area of 314 sq.cm.

**By using the first equation,**
C= 2 * pie * r.

After substituting the values we will get C= 2 * (22/7) * 10 and the final answer is 62.8 cm.

**By using the second equation,**
C= (4 * Area of circle)/diameter

After substituting the values,

C= (4 * 314)/20 = 62.8 cm.

Thus we found out the value of circumference of the circle using area as well as using the radius of the circle.

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