Planes Perpendicular To A Line Small 320×273 Medium 640×546 Large 1024×873 Download Tiff Original 2400×2046 | (414.6 KB) Description "Two planes perpendicular to the same straight line are parallel." Keywords parallels, perpendiculars, planes, proof, proofs, theorem, theorems Galleries Geometric Theorems and Proofs Source: Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
