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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-1

  • question_answer
    The area of a circle is \[1386\text{ }{{m}^{2}}.\] Find its circumference.

    A)  444 m 

    B)  70 m

    C)  132 m 

    D)  19 m  

    Correct Answer: C

    Solution :

    \[\pi {{r}^{2}}=1386\]. \[\Rightarrow \,\] \[\frac{22}{7}\times {{r}^{2}}=1386\] \[\Rightarrow \,\] \[{{r}^{2}}=\frac{1386\times 7}{22}=63\times 7\] \[\Rightarrow \,\] \[{{r}^{2}}=\sqrt{7\times 3\times 3\times 7}=21\,\,m\] \[\therefore \] Circumference\[=2\times \frac{22}{7}\times 21=132m\]


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