Parallel, Perpendicular, and Planes.
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parallel, perdindicular, and plane
Different triangles may have none, one, or three lines of symmetry.
Three sets of four each.
Depending on the triangle, there may be three, one, or none.
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.