Equal Right Angles Small 320×106 Medium 640×213 Large 1024×340 Download Tiff Original 2400×797 | (105.0 KB) Description Illustration used to prove that all right angles are equal. Keywords angle, equal, geometry, right angles Galleries Geometric Theorems and Proofs Source: C. A. Hart & Daniel D. Feldman Plane And Solid Geometry (New York: American Book Company, 1911) 15
