How do you find the circumference of a circle?
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For example:
The circle has a radius of 5, find the circumference.
2 times 5 times Pi = 10 times Pi which is approximately 31.4 if you use 3.14 for Pi. Sometimes it is suggested to use 22/7 as an approximation for Pi. Given the radius of 5, you can find the diameter by doubling that, which is 10. Then multiply by Pi and you get the same answer.
You can also get the circumference if you know the area of the circle.
For example:
The area of a circle is 36Pi units squared, find the circumference. The formula for area of a circle is Pi times radius squared. So you take 36Pi = Pi(r squared). Divide the equation by Pi to get 36 = r squared. So r is 6. Now that you know the radius is 6, use the formula for circumference to get 2(6)Pi= 12Pi, which is approximately 37.68.
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M$
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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