Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 482
B^ = i8o - i>° b1°=i8o°-B° Cl°=iSo°-e° *1°=i8o0-C° The relations between the two triangles are reciprocal; each triangleis the polar of the other. The principal use of the polar triangle is in the solution of sphericaltriangles. It reduces, to one-half, the number of cases necessary to bedealt… … 363. Problem.—To solve a spherical triangle or tri-hedral angle, having given:—I. Three sides, or three angles.II. Two sides and the included angle, or two angles and theadjacent side. III. Two sides and one angle opposite toone of them, or two angles and a side opposite to one. Case I.—Let the…
