Triangular Pyramid For Volume Small 320×120 Medium 640×239 Large 1024×383 Download TIFF Original 2400×897 | (355.8 KB) Description Illustration of triangular pyramid used to show that the volume is the limit of the sum of the volumes of a series of inscribed, or circumscribed prisms of equal altitude, if the number of prisms is indefinitely increased. Keywords geometric solid, limit, prism, prisms, pyramid, pyramids, solids, triangular base, volume Galleries Pyramids Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 312