Like we use πD to get the circumefrence of the circle but why we use π please explain
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A long time ago, people realized that no matter what size circle you have, the ratio between the circumference and the diameter is always the same. This ratio is now defined as pi. It ends up being useful in many places, especially in mathematics and physics when dealing with stuff involving circles, arcs, and rotation. It is an irrational number, and many people are fascinated with its never-ending stream of digits when representing it in decimal form.
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