10th Class Mathematics Surface Areas and Volumes Question Bank Surface Area and Volume

  • question_answer
    The total surface area of a cylinder is 220 sq cm with height 6.5 cm. Find its volume.

    A)  \[\text{25}.0\text{25 c}{{\text{m}}^{\text{3}}}\]             

    B)  \[\text{2}.\text{5}0\text{25 c}{{\text{m}}^{\text{3}}}\]

    C)  \[\text{25}0\text{2}.\text{5 c}{{\text{m}}^{\text{3}}}\]   

    D)         \[\text{25}0.\text{25 c}{{\text{m}}^{\text{3}}}\]

    Correct Answer: D

    Solution :

     \[TSA=2\pi r(r+h)\] \[220=2\times \frac{22}{7}\times r\left( r+\frac{13}{2} \right)\] \[\Rightarrow \]               \[r=-10,\frac{7}{2}\] Since radius cannot be ? ve, \[\therefore \]\[r=\frac{7}{2}\] \[\therefore \]\[V=\pi {{r}^{2}}h=250.25\,c{{m}^{3}}\] Hence, volume of the cylinder \[=\text{25}0.\text{25 c}{{\text{m}}^{\text{3}}}\]


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