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To make a Riemann sum, we must choose how we're going to make our rectangles. One possible choice is to make our rectangles touch the curve with their top-left corners. This is called a left Riemann sum. The shaded area below the curve is divided into 4 rectangles of equal width.
0:37 6:16 Suggested clip Calculating a Definite Integral Using Riemann Sums — Part 1 YouTubeStart of suggested client of suggested clip Calculating a Definite Integral Using Riemann Sums — Part 1
The midpoint Riemann sums is an attempt to balance these two extremes, so generally it is more accurate. The Mean Value Theorem for Integrals guarantees (for appropriate functions f) that a point c exists in [a, b] such that the area under the curve is equal to the area f(c)(BA).
In mathematics, a Riemann sum is a certain kind of approximation of an integral by a finite sum. This approach can be used to find a numerical approximation for a definite integral even if the fundamental theorem of calculus does not make it easy to find a closed-form solution.
0:37 6:16 Suggested clip Calculating a Definite Integral Using Riemann Sums — Part 1 YouTubeStart of suggested client of suggested clip Calculating a Definite Integral Using Riemann Sums — Part 1
A Riemann Sum is a method for approximating the total area underneath a curve on a graph, otherwise known as an integral. We saw that as we increased the number of intervals (and decreased the width of the rectangles) the sum of the areas of the rectangles approached the area under the curve.

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