Here, we can create various solids formed by stacking prisms (with varying cross-sectional bases parallel to the yAxis) from x = a to x = b. (Ex: see pic below).
We form such a solid by stacking prisms of width = dx & where .
a = lower limit of integration (modifiable via slider)
b = upper limit of integration (also modifiable via slider)
n = number of prisms with height = dx. This is also modifiable by using the n slider.
You can also change
f(x) = upper (greater) function
g(x) = lower (lesser) function
For each of these demos (shown below), the upper function is , and the lower function is . In these demos, a = -8 & b = 8.

Ex:

HOW TO EXPLORE:

Directions:
1) Open up GeoGebra 3D app on your device.
2) Click on the 3 horizontal bars (upper left corner). Select OPEN.
For cross sections parallel to the yAxis that are...
EQUILATERAL TRIANGLES (where f(x) - g(x) = one side), type this code: XArpgR3ASQUARES (where f(x) - g(x) = one side), type this code: y7mnphxmISOSCELES RIGHT TRIANGLES (where f(x) - g(x) = LEG), type this code: shks2q7vREGULAR PENTAGONS (where f(x) - g(x) = one side), type this code: zmhqnrqbSEMICIRCLES (with diameter = f(x) - g(x)), type this code: cygnvepm