prove that circumference of circle is 2rpi
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Answer:
Basically this is a definition thing.
π
is defined to be the ratio of the circumference of a circle over its diameter (or 2 times its radius).
This ratio is a constant since all circles are geometrically similar and linear proportions between any similar geometric figures are constant.
If you were looking for how the value of the ratio
π
is calculated or how we know that the same ratio applies to the area of a circle, then those are different questions. (Ask if either of these are what you were looking for).
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