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  1. There are two cones. The curved surface area of one is twice that of the other. The slant height of the latter is twice that of the former. The ratio of their radii is
    1. 4 : 1
    2. 4 : 3
    3. 3 : 4
    4. 1 : 4
Correct Option: A

Curved surface area of first cone = πr1l1
Curved surface area of second cone = πr2l2
πr1l1 = 2πr2l2
π r1l1 = 2r2l2

⇒
r1
 =
2l2
 =
2 × 2l1
 =
4
 = 4 : 1
r2l1l11


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