Definite integral as the limit of a Riemann sum | AP Calculus AB | Khan Academy - JJtheTutor

Definite integrals represent the exact area under a given curve, and Riemann sums are used to approximate those areas. However, if we take Riemann sums with infinite rectangles of infinitely small width (using limits), we get the exact area, i.e. the definite integral! Created by Sal Khan. Practice this lesson yourself on KhanAcademy.org right now:…