The document discusses the volume formula for a triangular prism. It begins by reviewing the volume formula for a rectangular prism, which is length times width times height. It then derives the volume formula for a triangular prism, which is (1/2) times the base times height times length. The document works through various representations of the area of the triangular base and confirms the volume formula for a triangular prism is (1/2) times the base times height times length.