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emmainna [20.7K]
3 years ago
6

What are some things about the relationship of the circumference and the diameter of a circle?

Mathematics
1 answer:
Sholpan [36]3 years ago
6 0
The most notable relationship is that you can find the circumference of a circle with a diameter. Multiply the diameter times pi, and you will find your circumference.

You can also divide your circumference by pi to find your diameter.
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Use the formula A = pi*r^2 to see why this is the case. You plug in A = 81pi and solve for r to get r = 9.

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Once you know the radius, you can determine the circumference C

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