The height of a right circular cone and ...

The height of a right circular cone and the radius of its circular base are respectively 9cm and 3cm. The cone is cut by a plane parallel to its base so as to divide it into two parts. The volume of the frustum (i.e., the lower part) of the cone is 44 cu cm. The radius of the upper circular surface of the frustum `( pi = (22)/7)` is -

`root(3)12cm`

`root(3)13cm`

`root(3)6cm`

`root(3)20cm`

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