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7th Class Mathematics Mensuration Question Bank Mensuration (Perimeter & Area)

  • question_answer
    The area of an equilateral triangle is \[100\sqrt{3}{{m}^{2}}.\] Find the perimeter of this triangle.

    A)  \[27.5\,m\]                              

    B)  \[4.5m\]        

    C)  \[60m\]        

    D)  \[10m\]

    Correct Answer: C

    Solution :

    (c): \[A=\frac{\sqrt{3}}{4}{{a}^{2}}=100\sqrt{3}\Rightarrow {{a}^{2}}=400\Rightarrow a=20\] Perimeter \[=3\text{ }a=60\]             


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