1.

The surface area of a sphere is 346.5 `cm^2`, calculate its radius and the volume.

Answer» Surface area of sphere=`4pir^2`
`4pir^2=346.5`
`4*3.14*r^2=346.5`
`r^2=346.5/(4*3.14)`
`r=5.2 cm`
Volume of sphere=`4/3pir^3`
`=4/3*22/7*(5.2)^2`
`=589.21 cm^3`.


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