1. The document discusses how to calculate the volume of prisms. Volume is the number of cubic units needed to fill a space, and a cubic unit is the space occupied by a cube of unit measure. 2. The volume of a prism can be calculated using the formula V = Bh, where B is the area of the base and h is the height of the prism. 3. Examples are provided to demonstrate calculating the volume of rectangular and triangular prisms using measurements of the base and height.