Relationships In A Spherical Triangle Small 185×320 Medium 370×640 Large 591×1024 Download Tiff Original 1386×2400 | (189.8 KB) Description Illustration used to extend the law of cosines when finding the relation between the three sides and an angle of a spherical triangle. In this case both angles b and c are greater than 90°. Keywords analytic geometry, angle, cosine, sector, spherical triangles, trigonometric, trigonometry Galleries Spheres Source: George N. Bauer, PH.D. and W.E. Brooke, C.E., M.A. Plane And Spherical Trigonometry (Boston: D.C. Heath & Co., 1917) 130 Courtesy the private collection of Roy Winkelman