Like we use πD to get the circumefrence of the circle but why we use π please explain
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Pi is, essentially be definition, the ratio of a circle’s circumference to its diameter. So it’s really pi = c/D by definition, so once you know the value of pi then c=piD. You can use this definition to calculate pi by taking polygons with more and more sides (getting closer and closer to a circle). It’s not a very efficient way to do it but it works.
Pi is much more mathematically fundamental than that, it shows up in all kinds of places you might not expect it, but comes down to the basic definition.
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