Vrutthakshethre paridhigunitha vyaasapaada:

phalam thath kshunnam vedairupari paritha:

kandukasyeva jaalam golasyaivam thadapi cha phalam

prushtajam vyaasanighnam shadbhirbhaktham

bhavathi niyatham golagarbhe ghanaakhyam

  When circumference is multiplied with diameter and that result divided by 4, that will give the area of a circle. This when multiplied with 4 gives the surface area of the globe which is like surface of a ball. This when multiplied with diameter and divided by 6 gives the volume of the sphere of globe. Mathematically it can be written as 2r x 2r/4 =r2

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