Right Spherical Triangle Small 320×299 Medium 640×598 Large 1024×957 Download Tiff Original 2400×2244 | (343.0 KB) Description Illustration of a right spherical triangle with a and b the sides, and α and β the angles opposite them. Side c is the hypotenuse. Keywords analytic geometry, angle, right spherical triangles, sector, 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) 135 Courtesy the private collection of Roy Winkelman