Question

The radius of a sphere is increased by 20%. the surface area increases by

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Answer 1

let radius of sphere =100 unit

so, volume of sphere =10^6 {4/3pi}

a/c to question ,

radius =100+100 x 20/100=120 unit

now,

volume of sphere=1728x 10^3 {4/3pi}

hence % increase in volume =72.8 %