Why we use Pi in Circle formula? Circumference & area of Circle का formula कैसे बना

Hi,
In this video there is complete explanation about - what is Pi ? Why pi uses in circle formula. Why 14th March is Pi day.
और साथ में Circumference ( परिधि ) and Area ( छेत्रफल ) of Circle का formula कैसे आया हैं उसे इस video में detail से explaine किया गया हैं.
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