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:
- 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).
- 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.
- 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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