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प्रश्न
Find the surface area of a sphere of radius 4.2 cm. (π = `22/7`)
उत्तर
Radius (r) of a sphere = 4.2 cm
Surface area of a sphere = 4πr2
`=4xx22/7xx(4.2)^2`
`=221.76cm^2`
Thus, the surface area of sphere is 221.76 cm2
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