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6th Class Mathematics Mensuration Question Bank Menstruation

  • question_answer
    DIRECTIONS: Passage-5 Read the passage(s) given below and answer the questions that follow. The area of a circle whose radius is 6 cm is trisected by two concentric circles. The radius of smallest circle is \[2\sqrt{3}\,cm\].

    A)

    B)

    C)

    D)

    Correct Answer: B

    Solution :

         OA = 6 cm. Area \[=\pi {{r}^{2}}={{\pi }^{2}}=36\,c{{m}^{2}}\]. Area of smallest circle with radius OC \[\Rightarrow \]            \[\pi \times {{(OC)}^{2}}=12\pi \] \[\Rightarrow \]            \[OC=2\sqrt{3}\,cm\].


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