Q. 15

# The radius of a sphere shrinks from 10 cm to 9.8 cm. Find approximately the decrease in (i) volume, and (ii) surface area.

Decrease in radius = dr = 10-9.8

dr = 0.2

Volume of the sphere is given by =

Change in volume =

Surface area of the sphere is given by =

Change in volume =

dA = 8π×10× 0.2

dA = 16π.

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