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7th Class Mathematics Perimeter and Area Question Bank Perimeter and Area

  • question_answer
    If the radius of a circle is tripled, the are becomes

    A)  9 times        

    B)         3 times           

    C)         6 times       

    D)         30 times                     

    Correct Answer: A

    Solution :

            Let the radius of original circle be r. \[\therefore \]   Area of the circle \[=\pi {{r}^{2}}\] Now, radius becomes tripled i.e., 3r Thus, area of the new circle \[=\pi {{(3r)}^{2}}\] \[=9\pi {{r}^{2}}=9\times \](original area)


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