Derivation of the volume of a pyramid via a prism, whose volume is known. Again, notice that the result can then be extended to other pyramids and cones by using Cavalieri's principle.[br][br]Follow the directions on the screen. After you click "Investigate the 3 pyramids," you should check/uncheck "Volume[math]_1[/math]=Volume[math]_3[/math]" and "Volume[math]_2[/math]=Volume[math]_3[/math]" to convince yourself that the 3 pyramids have equal volumes.[br][br]If you wish, you are able to adjust the shape of the triangular base by moving its vertices.