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प्रश्न
The surface area of a sphere is 616 sq cm. Find its radius. `["Use "pi = 22/7]`
बेरीज
उत्तर
The surface area of the sphere = 616 cm2
Since, the surface area of the sphere = 4πr2
Therefore,
4πr2 = 616
4 × `22/7` × r2 = 616
r2 = 616 × `7/4` × `1/22`
r2 = 49
r = `sqrt49`
r = 7 cm
∴ Required radius, r = 7cm
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