¶ Central Angles & Surface Angles
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Index Entry
Central Angles & Surface Angles:
“The edges of all spherical triangles are arcs of great circles of a sphere and those arc edges are measured in term of their central angles (i.e., from the center of the sphere). But plane surface triangles have no inherent central angles and their edges are measured in relative lengths of one of themselves or in special-case linear increments. Spherical triangles have three surface (corner) angles and three central (edge) angles.”
¶ Citations
