Why circumference of a circle is pi r +2r？
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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.
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The circumference of a circle is =2 Pir square
The radius of a circle is=pi r 2
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