## Quick Reference

A triangle on a sphere, with three vertices and three sides that are arcs of great circles. The angles of a spherical triangle do not add up to 180°. In fact, the sum of the angles can be anything between 180° and 540°. Consider, for example, a spherical triangle with one vertex at the North Pole and the other two vertices on the equator of the Earth.

*Subjects:*
Mathematics.

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