You divide the horizontal length under the part of the function you want to evaluate into "n" equal pieces. That is the n on top of the � (Greek letter sigma). The (xi-xi-1) represents the size of one horizontal segment that is created from dividing the whole by the "n". The f(yi) is a y value in an "n" segment. Since the area of a rectangle is "length" × "width", the multiplication of xi and f(yi) is the area of a rectangle for that part of the graph. The � means we add up all of these small rectangles to get an approximation of the area under the segment of a function.= = = Beatitudes = = =
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