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Q.

The diameters of the ends of a frustum of a cone are 32cm and 20 cm. If its slant height is 10cm, then its lateral surface area is

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a

321 π cm2

b

250 π cm2

c

300 π cm2

d

260 π cm2

answer is C.

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Detailed Solution

R=16 cm, ​r=10​ cm, l=10 cm

LSA of frustum =πL(R+r)

=π×10(16+10)

=260π cm2

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