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8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    Find the sum of the lengths of the parallel sides of a trapezium whose altitude is 11 cm and whose area is\[\text{0}\text{.55 }{{\text{m}}^{\text{2}}}\].

    A)  25m               

    B)  15m   

    C)  12m   

    D)         10m   

    Correct Answer: D

    Solution :

    \[\text{Height =11 cm}=\frac{11}{100}m\] Area of trapezium \[=\text{ }0.55\text{ }{{m}^{2}}\] \[\Rightarrow \frac{\text{1}}{\text{2}}\text{ }\!\!\times\!\!\text{ Height}\times \text{(sum of parallel sides)=0}\text{.55}\] \[\Rightarrow \text{Sum of parallel sides=}\frac{0.55\times 2\times 100}{11}=10m\]


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