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प्रश्न
Find the volume and surface area of a sphere of radius 8.4 cm.
`(pi=22/7)`
उत्तर
Radius of the sphere = 8.4 cm.
Volume of a sphere is `4/3pir^3`
`= 4/3 xx (22/7) xx 8.4^3`
`= (4 xx 22 xx 84 xx 8.4^2 xx 10^-1)/21`
`= 352 xx 70.56 xx 10^-1`
= 2483.71 cm3
Surface area of a sphere is 4πr2
`= 4 xx (22/7) xx 8.4^2`
`= (4 xx 22 xx 84 xx 8.4 xx 10^-1)/7`
`= 4 xx 22 xx 12 xx 8.4 xx 10^-1`
= 887.04 cm2
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