Triangle ABC Small 320×153 Medium 640×306 Large 1024×490 Download Tiff Original 2400×1149 | (135.3 KB) Description Illustration showing a triangle with angles A, B, and C labeled. Keywords ABC, angle, angles, geometry, polygon, shape, side, triangle, triangles Galleries Miscellaneous Triangles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 33
