Washer Method: REVAMPED!
In this resource, you can enter/modify any of the following parameters:  
f = greater function
g = lesser function
a = lower limit of integration
b = upper limit of integration
n = number of differential rectangles. Width of each rectangle = .  
To explore this resource in Augmented Reality, see the directions below the applet. 
To Explore in Augmented Reality:
1) Open up GeoGebra 3D app on your device. 
  
2) Go to the menu (upper left).  
     Select OPEN.  Under SEARCH, type fy3c4pyf
3) The  slider controls the angle.  
     a and b control the upper and lower limits of integration.  
     The colored filling sliders are also there.  
     To change the function (even though it's labeled "f"), change function h.  
     n = number of washers.