8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer How many meters of cloth 2.5 m wide will be required to make a conical tent whose base radius is 7m and height is 24 m.

    A)  220 m     

    B)  150 m          

    C)  300 m                         

    D)  300 m

    Correct Answer: A

    Solution :

    (a): area of tent \[=\pi rl=\pi r\sqrt{{{r}^{2}}+{{h}^{2}}}\] \[=\frac{22}{7}\times 3.5\times \sqrt{{{(3.5)}^{2}}+{{24}^{2}}}\] \[=11\times \sqrt{7588.25}.\]

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