Equal Segments In An Isosceles Triangle Small 259×320 Medium 517×640 Large 827×1024 Download Tiff Original 1939×2400 | (402.4 KB) Description Illustration showing that if equal segments measured from the vertex are laid off on the arms of an isosceles triangle, the lines joining the ends of these segments to the opposite ends of the base will be equal. Keywords angle bisector, congruent angles, congruent segments, equal, isosceles triangle, triangles, Vertex Galleries Geometric Theorems and Proofs Source: C. A. Hart & Daniel D. Feldman Plane And Solid Geometry (New York: American Book Company, 1911) 29 Courtesy the private collection of Roy Winkelman