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If you use pi as 3.14, the answer is 12.56. If you use the pi button on your calculator, it is still simplified to 12.56, but if you want the full number, it is 12.56637061. The algebra is pi multiplied by diameter OR pi multiplied by radius squared Pi is often just used as 3.14

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Q: Given a circle with the diameter of 4 what is the circumference?
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Given a circle with a diameter of 4 what is the circumference?

Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).


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