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5th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    The sides of a triangle are in the ratio\[3:4:5\]. If the longest side is\[15\,\,cm\], what is the perimeter of the triangle?

    A) \[18\,\,cm\]                   

    B)           \[48\,\,cm\]                   

    C)           \[24\,\,cm\]                   

    D)           \[36\,\,cm\]

    Correct Answer: D

    Solution :

    Ratio of sides of a triangle is\[3:4:5\] The longest side \[=15\,\,cm=5\] units \[\therefore \]\[1\]unit\[=\frac{15}{5}cm=3\,\,cm\] Hence, \[3\,\,units=9\,\,cm\] and      \[4\,\,units=12\,\,cm\] Therefore, perimeter of the triangle             \[=(9+12+15)cm\]             \[=36\,\,cm\]


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