Like we use πD to get the circumefrence of the circle but why we use π please explain
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[This animated image shows you exactly what pi is](https://c.tenor.com/ir3reAFy0v4AAAAd/radians-math.gif).
The length of the edge of half a circle is exactly pi times its radius. This idea helps us measure anything that rotates, which is a lot of the world around us.
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