Pentagonal Pyramid For Volume Small 320×135 Medium 640×270 Large 1024×433 Download TIFF Original 2400×1014 | (249.3 KB) Description Illustration of pentagonal pyramid used to show that the volume is equal to one third of the product of its base by its altitude. Keywords altitude, base, geometric solid, pentagonal base, pyramid, pyramids, solids, volume Galleries Pyramids Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 316