I found a nice little app called Geometry: Volume of solids lite. It has short videos explaining volume for rectangular prism, cylinder, sphere, pyramid and cone, the most common shapes our students are required to learn. I downloaded it last night and plan to check it out over the weekend so I can give a more accurate review. I watched a bit of the pyramid one and it had a 3 dimensional representation of the shape that turned around so students get a full look at all sides of it. The introduction takes time to show how they derive the volume formulas for the shapes. The best thing of all is that this is a free app. I plan to explore other apps by this person.
Last day to get the book free.