Segments Labeled In A Triangle Small 320×197 Medium 640×394 Large 1024×631 Download Tiff Original 2400×1478 | (144.4 KB) Description Illustration of triangle ABC with BE extended through the triangle at point D. Segment AB is equal to segment BD. Keywords angles, equal sides, geometry, proof, prove, segments labeled, side relationships, Sides, theorem, theorems, triangle, triangles Galleries Miscellaneous Triangles Source: C. A. Hart & Daniel D. Feldman Plane And Solid Geometry (New York: American Book Company, 1911) 62 Courtesy the private collection of Roy Winkelman