How it works ?
Enter any UPPER FUNCTION (labeled upper(x)).
Enter any LOWER FUNCTION (labeled lower(x)).
Enter your lower and upper limits of integration (“a” and “b”, respectively).
Slide the FILLING slider all the way to the left. For this solid, note how cross sections parallel to the yAxis are rectangles. One side of this rectangle (the base) has length = upper(x) – lower(x). The other side (height) of this rectangle has length = w * (upper(x) – lower(x)).
Thus, the height of any rectangular cross section = w * its base length. You can alter the value of w using the (vertical) w slider.
You can move this rectangle by sliding the MoveMe slider OR by dragging the WHITE POINT along the xAxis.
You can modify any of these parameters (functions, limits) at any time.