10th Class Mathematics Solved Paper - Mathematics 2017 Delhi Set-I

  • question_answer
    Volume and surface area of a solid hemisphere are numerically equal. What is the diameter of hemisphere?

    Answer:

    Let radius of hemisphere be r units
    Volume of hemisphere = S.A. of hemisphere
                            \[\frac{2}{3}\pi {{r}^{3}}=3\pi {{r}^{2}}\]
    \[\Rightarrow \]               \[r=\frac{9}{2}\] or diameter \[=9\,\] units


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