[" 15.The total surface area of a cone w...

[" 15.The total surface area of a cone whose radius is "(r)/(2)" and slant height "2l" is "],[[" (1) "2 pi r(1+r)," (2) "pi r(1+(r)/(4))," (3) "pi r(1+r)," (4) "2 pi rl]]

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