The ratio of curved surface area of two cones is 1 : 8 and t

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The ratio of curved surface area of two cones is 1 : 8 and the ratio of there slant heights is 1 : 4. What is the ratio of the radius of the two cones?

[SSC CPO 2 July 2017 Morning Shift With Answers]

A 1 : 1

B 1 : 2,

C 1 : 4,

D 1 : 8,