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7th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    In the given fig. ABCD is a parallelogram. \[\text{DL}\bot \text{AB}\] and \[\text{DM}\bot \text{BC}\text{.}\] If AB = 18cm, BC = 12cm and DM = 10 cm. Find DL.

    A)  \[6\frac{1}{2}cm\]                

    B)  \[6cm\]

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

    D) None of these

    Correct Answer: C

    Solution :

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


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