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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    A rectangle is 3p cm long and \[2p\text{ }cm\] wide. Find the perimeter of the rectangle when \[p=12\].

    A)  \[102\,cm\]     

    B)         \[120\,cm\]  

    C)  \[210\,cm\]     

    D)         \[10p\,cm\]

    Correct Answer: B

    Solution :

     Perimeter \[=2\,(l+b)\] \[=2\,\,(3p+2p)\] \[=2\,\,(5p)=10p\,\,cm\] \[\therefore \] Perimeter when \[p=12\text{ }cm\] is \[10(12)=120cm.\].


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