2 Intersecting Planes Perpendicular To A Third Plane Small 320×235 Medium 640×469 Large 1024×751 Download Tiff Original 2400×1760 | (265.0 KB) Description "If two intersecting planes are each perpendicular to a third plane, their intersection is also perpendicular to that plane." Keywords intersection, intersections, perpendiculars Galleries Geometric Theorems and Proofs Source: Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
