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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-34

  • 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 (in sq m) of canvas required to put up such a tent\[\left( \text{Take}\,\,\pi =\frac{22}{7} \right)\] is nearly

    A)  301 7.1

    B)  3170

    C)  301.7  

    D)  30.17

    Correct Answer: C

    Solution :

    \[\because \]r = 9.6 m, h = 2.8 m \[\because \]\[l=\sqrt{{{h}^{2}}+{{r}^{2}}}=\sqrt{{{(2.5)}^{2}}-{{(0.7)}^{2}}}\]      \[=\sqrt{7.84+92.16}=\sqrt{100}=10\,\,m\] \[\therefore \]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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