Reference Angles/Triangles Formed by Angles in Quadrants With Labels Small 320×223 Medium 640×445 Large 1024×713 Download Tiff Original 2400×1670 | (242.1 KB) Description Lines drawn to horizontal to form triangle ratios (reference triangles, angles). Axes, quadrants, abscissa, ordinate, and distance labeled. Keywords abscissa, angles, Distance, ordinate, quadrants, reference angle, reference triangle, triangles, trig ratios, trigonometric angle, trigonometry Galleries Trigonometry: Angles Source: Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 405
