Riemann Sum

A Riemann sum is a way to approximate the total value of a function over an interval. It does this by dividing the interval into smaller segments, then calculating the area of rectangles that approximate the shape under the curve. Summing these rectangular areas gives an estimate of the total area, which approaches the exact value as the segments become smaller. This method helps in understanding and calculating the integral of a function, bridging the gap between simple geometric shapes and more complex curves.