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NTSE Sample Paper NTSE SAT Practice Test-20

  • question_answer
    If the radius of a circle is reduced by 10%,then its area is reduced by

    A) 20%                             

    B) 10%

    C) 19%   

    D) 25%

    Correct Answer: C

    Solution :

    [c] \[\pi {{r}^{2}}-\pi {{(90%r)}^{2}}=\pi {{r}^{2}}\left( 1-\frac{81}{100} \right)=19%.\,\,\pi {{r}^{2}}\] \[\therefore \] Area is reduced by 19 %.                             


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