"The altitude of two-base paraboloid is 8in. and the upper base has an area which is four times the area of the lower base.Find the radii of the solid if the volume is 125pi cube in. "
By squared property of parabola
The volume of paraboloid is given by the formula V = ½πr2h. In the solution, the volume is the difference of paraboloid of radius R and height y1 and paraboloid of radius r and height y2.