Line Perpendicular to Plane Small 255×320 Medium 511×640 Large 817×1024 Download Tiff Original 1915×2400 | (217.6 KB) Description If a straight line is perpendicular to each of two other straight lines in a plane at their point of intersection, it is perpendicular to the plane of the two lines. Keywords intersecting planes, intersection, line, lines, perpendicular, plane, planes Galleries Planes Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 254