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SSC Sample Paper SSC CGL - Sample Paper-4

  • question_answer
    If the length of the diagonal of a square is 20 cm, then its perimeter must be

    A)  \[40\sqrt{2}\,\,cm\]       

    B)  \[40\,\,cm\]

    C)  \[200\,\,cm~\]              

    D)  \[10\sqrt{2}\,\,cm~\]

    Correct Answer: A

    Solution :

    Let a be the side of square. \[\therefore \]      \[a\sqrt{2}=20\] \[\Rightarrow \]   \[a=\frac{20}{2}\sqrt{2}\]             \[=10\sqrt{2}\,cm\] \[\therefore \] Perimeter of square             \[=4\times a=4\times 10\sqrt{2}\]             \[=40\sqrt{2}\,cm\]       


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