Prisms https://www.youtube.com/watch?v=wxDTrgnyu28Prisms are three-dimensional closed surfaces.A prism has two parallel faces, called bases, that are congruent polygons. The lateral faces are rectangles in a right prism, or parallelograms in an oblique prism. In a right prism, the joining edges and faces are perpendicular to the base faces. Prisms are also called … [Read more...] about Prisms