# Upper and lower Riemann Sums

This applet shows how upper and lower Riemann sums can approximate an integral $\int^b_a f(x) \, \textrm{d}x$[br]Further, they show that as the number of strips $n$ increases, the Riemann sums converge to true value of the definite integral.[br]Input your own function into the textbox and set the limits to different values.