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From Two Dimensions to Three In Mr. Postiglione's Geometry class we learned early on that two dimensional shapes only exist in our imagination . With the introduction of figures, the class was able to see how Geometry is all around us. First we studied which was basically the number of in a 3-D figure. If one was made up of 10 cubes, its volume was 10 units. Our first examples were solids which had six sides called and whose volume formula is: Cubes had the same length, width and depth. If they weren't the same they would be called (like the recreational vehicle we talked about). Then we looked at prisms which were solids with two and faces joined by parallelograms (usually rectangles). A prism had two faces that were triangles. We also studied spheres (balls) and pyramids (three-dimensional triangles). The volume formula of the first was and the second was where "B" stood for the area of its A pyramid got its name by the type of it had. For instance, the pyramids of Ancient Egypt were pyramids and the subject of our next and final project. Cylinders had two identical for ends with a tube-like sleeve joining them. Mr. P' showed us how this tube opened up into a that was the same height as the cylinder but its length was the same measure as the of the circles. Finally, we were introduced to which was basically the sum of the areas of the faces of a 3-D object. Here we were introduced to the important height of pyramids and for multi-sided faces we had to recall which we learned were the radii of inscribed circles