Parallel, Perpendicular, and Planes.
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parallel, perdindicular, and plane
Different triangles may have none, one, or three lines of symmetry.
Depending on the triangle, there may be three, one, or none.
Three sets of four each.
The answer depends on the context. Angles are related in many ways: parallel lines, angles at a point, angles in a polygon - all impose constraints on angles from which their measure may be determined.