8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    The slant height of a cone is increased by P%. If radius remains same, the curved surface area is increased by

    A) P%                

    B)  \[{{P}^{2}}%\]

    C) 2P%               

    D) None of these

    Correct Answer: A

    Solution :

    Curved surface area \[\frac{\sqrt{3}}{2}{{(side)}^{2}}.\]. New curved surface area \[=\sqrt{3}\] Percentage increase \[\Delta ABC=\frac{1}{2}\times base\times height=\frac{1}{2}\times BC\times AD\]            


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