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

  • question_answer If the area of a circle is A, radius is r and circumference is C, which of the following is true?

    A) \[rC=2A\]                   

    B)  \[\frac{C}{A}=\frac{r}{2}\]

    C) \[AC=\frac{{{r}^{2}}}{2}\]                      

    D)  \[\frac{A}{r}=C\]

    Correct Answer: A

    Solution :

    \[A=\pi {{r}^{2}};\,\,C=2\pi r\] \[\Rightarrow \]\[2A=2\pi {{r}^{2}}\Rightarrow \frac{2A}{r}=2\pi r=C\Rightarrow 2A=r\times C\]

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