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Q.

If the slant height and the radius of the base of a right circular cone are ‘H’ and ‘r ’ respectively then the ratio of the areas of the lateral surface and the base is

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a

H : r

b

H² : r²

c

H : 2r

d

2H : r

answer is B.

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Detailed Solution

Question Image

When slant height H and radius r 

Lateral surface area =πrH

Area of the base=πr2

Ratio of L.S.A to base area=πrH:πr2=H:r

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