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  5. Mensuration

5th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    If the length and breadth of a rectangle are doubled how does its perimeter change?

    A)  Tripled

    B)                     Doubled

    C)                     Halved

    D)                     Remains the same

    Correct Answer: B

    Solution :

    Length\[(\ell )\], Breadth\[(b)\] \[\Rightarrow \]   \[P=2(\ell +b)\]units When length and breadth are doubled, \[l\to 2l\]                        \[b\to 2b\] Then     \[P=2(2l+2b)\]                \[=2\times [2(l+b)]=2\times P\] \[i.e.,\]perimeter is doubled.


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