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प्रश्न
The surface area of a sphere is 616 cm2. Its radius is ______.
पर्याय
7 cm
14 cm
21 cm
28 cm
MCQ
रिकाम्या जागा भरा
उत्तर
The surface area of a sphere is 616 cm2. Its radius is 7 cm.
Explanation:
Surface of a sphere = 616 cm2
`therefore 4 pi "r"^2 = 616`
`=> 4 xx 22/7 xx "r"^2` = 616
`=> "r"^2 = (616 xx 7)/(4 xx 22)` = 49
`=> "r" = sqrt49` = 7 cm
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