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

  • question_answer
    In the given figure, ABCD is a parallelogram. \[DL\bot AB\] and \[DM\bot BC\]. If \[AB=18cm,\] \[BC=12cm\]and \[DM=10cm,\]find DL                                

    A)  \[6\frac{1}{2}cm\]         

    B)         \[6\,cm\]

    C)                  \[6\frac{2}{3}\,cm\]        

    D)         \[6\frac{3}{4}\,cm\]

    Correct Answer: C

    Solution :

     Here we equate the areas, i.e., \[AB\times DL=BC\times DM\] \[\Rightarrow \] \[18\times DL=12\times 10\] \[\Rightarrow \] \[DL=\frac{12\times 10}{18}=\frac{20}{3}=6\frac{2}{3}cm\]


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