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  5. Surface Areas and Volumes

9th Class Mathematics Surface Areas and Volumes Question Bank Surface Area and Volume

  • question_answer
    The base of a right pyramid is a square of side 30 cm long. If the volume of the pyramid is 4500 cm3 then its height is

    A)  5 cm                       

    B)  10cm

    C)  15 cm   

    D)  20 cm

    Correct Answer: C

    Solution :

    (c): Area of the base \[=30\times 30=900\]sq.cm We know, Volume of pyramid \[=\frac{1}{3}\times area\text{ }of\text{ }base\times height\] \[\Rightarrow 4500=\frac{1}{3}\times 900\times h\] \[\Rightarrow h=\frac{4500\times 3}{900}=15cm\]                    


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