6th Class Mathematics Mensuration Question Bank Mensuration (Perimeter & Area, Review of Earlier Concepts)

  • question_answer If the area of a circle is\[154\,\,{{m}^{2}}\]. Find its diameter.

    A)  14 m                          

    B)  220 m        

    C)  22 m              

    D)  104 m

    Correct Answer: A

    Solution :

    \[A=\frac{\pi {{d}^{2}}}{4}=154\Rightarrow d\] \[=\sqrt{\frac{154\times 4}{\pi }}=\sqrt{\frac{154\times 4\times 7}{22}}\] \[=\sqrt{{{2}^{2}}\times {{7}^{2}}}=2\times 7=14\,cm\]

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