The volume of a solid is measured in cubic units ie. This battery measured 494 cm in height and 142 cm in diameter giving a volume of 782 cm 3 or 782 ml. Because the cross section of a disk is a circle with area p r 2 the volume of each disk is its area times its thickness.
V b ap fx2dx 4 1px2dx p4 1xdx p 2x2 4 1 15p 2.
If the axis of revolution is the boundary of the plane region and the cross sections are taken perpendicular to the axis of revolution then you use the disk method to find the volume of the solid. In order to calculate its surface area or volume you must know the radius of the base and the length of the side. S r2 h2. Free online calculators for area volume and surface area.