Like we use πD to get the circumefrence of the circle but why we use π please explain
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It is a magic number that is always the same and is what you multiply by how “wide” a circle is to get how “long” the outside of it is.
As for why it is that specific value, it is just how the universe works, there isn’t a real reason as for why it could not be a different value. Perhaps in a different universe where the laws of mathematics and physics are different, it might somehow be different. Who knows?
As for why it uses the greek value pi, we often use greek characters in mathematics (like capital pi for ‘all the things multiplied together’, capital sigma for ‘all the things added together’, etc).
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