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8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    A room is 15 metres long, 4 metres broad and 3 metres high. Find the cost of whitewashing its four walls at 50 P. per\[(\pi =3.14)\].

    A) Rs.60                          

    B) Rs 57

    C) Rs 55                          

    D) Rs 52

    Correct Answer: B

    Solution :

    Area of 4 walls \[s=\frac{a+b+c}{2}.\] \[\frac{\sqrt{3}}{2}{{(side)}^{2}}.\] Cost of painting at the rate of 50 paisa per \[=\sqrt{3}\] \[\Delta ABC=\frac{1}{2}\times base\times height=\frac{1}{2}\times BC\times AD\]


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