The region between x-axis and graph of function f on interval [a,b] has (net) area[br]which can be approximated by Riemann Sums computing total area for a collection of[br]adjacent rectangles with one side on axis and opposite side with a corner on the graph.

[list][*]Function f can be revised by typing a new expression in upper-right box.[br][/*][*]Ends of interval [a,b] can be changed by dragging points on x-axis or entering new values in labeled boxes. Note that the corresponding part of the graph is thickened.[/*][*]Choose number of rectangles with slider for n.[br][/*][*]Use the checkboxes to choose what to display.[br][/*][/list]