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प्रश्न
The surface area of a sphere is 616 cm2 . Find its radius.
उत्तर
The surface area of sphere = 616k cm2
We know that
`4pir^2 = 616`
`r^2 = (616)/(4pi)`
Taking squire root both the side
`sqrtr^2 = sqrt((616)/(4pi))`
`r = 7 cm`
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