Triangle in Quadrant II Small 320×217 Medium 640×434 Large 1024×695 Download TIFF Original 2400×1628 | (165.3 KB) Description Illustration of an angle with the terminal side used to draw a triangle in quadrant II. Keywords angle, cos, cosine, obtuse, quadrant 2, reference, sin, Sine, Tan, tangent, triangles, trig functions, trigonometric, trigonometry Galleries Trigonometry: Triangles Source: George N. Bauer, PH.D. and W.E. Brooke, C.E., M.A. Plane And Spherical Trigonometry (Boston: D.C. Heath & Co., 1917) 74