Railways Sample Paper RRB (Assistant Loco Pilot & Technician) Sample Test Paper-4

  • question_answer
    If the area of a circle is 75.46 cm, then what is the circumference of the circle?

    A)  29.2cm.          

    B)  28.9 cm.

    C)  30.8cm.          

    D)       40.2 cm.

    Correct Answer: C

    Solution :

     \[\frac{22}{7}\,\,{{r}^{2}}=75.46\] \[\Rightarrow \]  \[{{r}^{2}}=\frac{75.46\,\,\,\,\,7}{22}=\,\,24.01\] \[\Rightarrow \] \[r=\sqrt{24.01\,}\,\,\,=4.9\]cm. \[\therefore \]  Circumference of the circle                        \[=2\pi r=\,\,2\,\,\frac{22}{7}\,\,\,4.9=30.8\] cm.

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