Equal Triangles by Side Side Side Small 320×138 Medium 640×277 Large 1024×443 Download Tiff Original 2400×1038 | (2.4 MB) Description Illustration showing two equal triangles. This can be used to show that two triangles are equal if the three sides of the one are equal, respectively, to the three sides of the other. Keywords angle, angles, equal, geometry, polygon, shape, side, SSS, triangle, triangles Galleries Miscellaneous Triangles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 38 Courtesy the private collection of Roy Winkelman