| http://www.w3.org/ns/prov#value | - perfect squares, by the formula for the sum of the first r perfect squares.The volume of a cylinder with the same base and height is The ratio of the area of the cone to the cylinder is thereforeNote that if we had used a height other than r, the height would have canceled out anyway once we divided by the volume of the cylinder.Obviously, the more disks we have (the bigger r is), the more accurate
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