Most trigonometry students look at triangles on a flat surface. However, people from ancient astronomers to modern navigators calculated the arc lengths and angles of triangles on a sphere. They used ...
1. Direction Cosines (/) of a Line in Space (/) DCOS. A date reads: Jan 18-1945 (/) Wellesley May 1945. Threre are six pattern pieces, each in metal and in paper. A lined sheet of paper, dated Jan ...
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