#### The rainwater from a roof of dimensions 22 m x 20 m drains into a cylindrical vessel having a diameter of base 2 m and height; 3.5 m. If the rainwater collected from the roof just fill the cylindrical vessel, then find the rainfall in cm.

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#### The volume of a cone is the same as that of the cylinder whose height is 9 cm and diameter 40 cm. Find the radius of the base of the cone if its height is 108 cm.

**Solution:**

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