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Volume of Solids
Volume of Pyramid (Cabri 3D figures)
Compare 2 triangular pyramids with same base and height
Dissect a triangular prism into 3 pyramids of equal volume
Folding up 6 pyramids to make a cube
This model shows 3 congruent pyramids that can be put together to make a cube.
Compare volume of a hemisphere with those of a cone and cylinder of same base and height.
(Javasketchpad)

Solids of Revolution
Lesson design from HKU CMI center
Lathe (create 3D objects) : an applet in Wisweb  
user defines the curve, use the mouse to drag the 3D solid