Illustration that can be used to show supplementary angles. The angles form a straight line.
International Correspondence Schools I.C.S. Reference Library Mathematics (Scranton: International Textbook Company, 1905) Geometry & Trigonometry Pg. 2
2400×1114, 98.4 KiB
1024×475, 10.1 KiB
640×297, 6.0 KiB
320×148, 3.3 KiB