[b]This applet illustrates the concept of integrating cross-sectional area to produce volumes.[/b][br]Various possible cross-sections are shown to the left. Select any one you'd like. [br][br]f = top function[br]g = bottom function[br]n = number of equal intervals into which the interval [a, b] is divided. [br][br]Note: Cross sections are drawn parallel to the y-axis.