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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    The length of a rectangle is \[2(x+6)\,cm,\]and its width is half its length. What is its perimeter?

    A)  \[6(x-3)\,cm\]                 

    B)  \[6(x-6)\,cm\]

    C)  \[3(x+6)\,cm\]                

    D)   \[(6x+36)\,cm\]  

    Correct Answer: D

    Solution :

     Length \[=2(x+6)\,cm\] Width \[=\frac{1}{2}\times \] length \[=\frac{1}{2}\times 2\,(x+6)\,cm=(x+6)\,cm\] \[\therefore \] Perimeter \[=2\,(l+b)\]                 \[=2[2\,\,(x+6)+(x+6)]\,cm\]                 \[=6x+36\,cm\]


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