3 Intersecting Planes Small 320×299 Medium 640×598 Large 1024×956 Download Tiff Original 2570×2400 | (443.2 KB) Description Illustration of three intersecting planes. "The intersections of two parallel planes by a third plane are parallel lines." Keywords intersection, parallels, perpendicular, plane Galleries Geometric Theorems and Proofs Source: Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
