10th Class Mathematics Surface Areas and Volumes Question Bank Surface Area and Volume (Mensuration)

  • question_answer The diameters of two cones are equal. If their slant height be in the ratio \[5:7\], find the ratio of their curved surface areas.

    A)  \[25:7\]                        

    B)  \[25:49\]       

    C)  \[5:49\]           

    D)  \[5:7\]

    Correct Answer: D

    Solution :

    (d): Let the radius of the two cones be = ?x? cm Let slant height of 1st cone = 5y And, Slant height of 2nd cone = 7y Then, the ratio of curved surface area \[=\frac{\pi x.5y}{\pi x.7y}=5:7\]

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