1.

A dish, in the shape of a frustum of a cone, has a height of 6 cm. Its top and its bottom have radii of 24 cm and 16 cm respectively. Find its curved surface area (in `cm^(2)`).A. `240pi`B. `400pi`C. `180pi`D. `160pi`

Answer» Correct Answer - B
The bucket is in shape of a frustum. The slant height of a frustum
`=sqrt(("Top radius"-"Bottom Radius")^(2) +("Height")^(2)).`
` :. ` Slant height of the bucket
` l=sqrt((24-16)^(2)+6^(2))=10 m.`
` :. ` Its curved surface area `=pi (R+r)`
`=pi(10)(24+16)=400 pi m^(2)`.


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