Today I reviewed Riemann sums. In order to help me review I watched a Khan Academy video.
https://www.khanacademy.org/math/integral-calculus/indefinite-definite-integrals/riemann-sums/v/simple-riemann-approximation-using-rectangles
It explains how the Riemann sums are used to approximate the area under a curve. Because it is an approximation it does not give us an exact value, but sort of an idea of one. You break the curve up into rectangles and solve for the area of each one and add them up.
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