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  3. 7th Class
  4. Mathematics
  5. Mensuration

7th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    If the length and breadth of a rectangle are doubled then its perimeter is

    A) tripled                         

    B) doubled

    C) made half       

    D) None of these

    Correct Answer: B

    Solution :

        Let the initial length and breadth be \[l\]and b respectively. So, the initial perimeter\[=2\,(l+b)\] The final perimeter\[=2\,(2l+2b)\]                         \[=4\,(l+b)\] Now, \[\frac{\text{Final}\,\text{perimeter}}{\text{Initial}\,\text{perimeter}}=\frac{4\,(l+b)}{2(l+b)}=2.\]


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