SSC Sample Paper SSC CGL - Sample Paper-2

  • question_answer
    The base of conical tent is 19.2 m in diameter and the height of its vertex is 2.8 m. The area of canvas required to put up such a tent (in square metre)\[\left( \text{take}\,\,\pi =\frac{22}{7} \right)\] is

    A)  3017.1            

    B)  3170

    C)  301.7

    D)  30.17

    Correct Answer: C

    Solution :

    \[\therefore \] \[r=~9.6\,m,\] \[h=2.8\,m\] \[\therefore \]      \[l=\sqrt{{{h}^{2}}+{{r}^{2}}}=\sqrt{{{(2.8)}^{2}}+{{(9.6)}^{2}}}\]                         \[=\sqrt{7.84+92.16}\]                         \[=\sqrt{100}=10\,m\] \[\therefore \] Curved surface area \[=\pi \times 9.6\times 10\]             \[=\frac{22}{7}\times 9.6\times 10=301.7\,{{m}^{2}}\]

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