To find the circumference of a circle , you can use the following formula:

Formula for Circumference

Circumference=2πr\text{Circumference}=2\pi rCircumference=2πr

where:

• rrr is the radius of the circle
• π\pi π (pi) is approximately 3.14159

Alternatively, if you know the diameter ddd:

Circumference=πd\text{Circumference}=\pi dCircumference=πd

Steps to Find the Circumference:

1. Measure the radius (distance from the center of the circle to any point on the edge) or the diameter (distance across the circle through the center).
2. Use the formula :
   • If you have the radius, multiply it by 2 and then by π\pi π.
   • If you have the diameter, multiply it directly by π\pi π.
3. Calculate the value using π≈3.14\pi \approx 3.14π≈3.14 or use a calculator for more precision.

Example:

If the radius of a circle is 5 cm:

Circumference=2×π×5=10π≈31.42 cm\text{Circumference}=2\times \pi \times 5=10\pi \approx 31.42\text{ cm}Circumference=2×π×5=10π≈31.42 cm

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