Question

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A solid is hemispherical at the bottom and conical (of same radius) above it . If the surface areas of the two parts are equal, then the ratio of its radius and the slant height of the conical part is.........

Answer 1

Answer: 2:1

Area of cone = area of hemispher

πrl = 2πr^2

Cancel π and one r.

l = 2r

r/l = 1/2

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