trihedral angle
mathematics
Quick Summary
A trihedral angle is a geometric concept referring to a polyhedral angle with three faces. It is a three-dimensional angle formed at a vertex where three planes intersect. This is distinct from a triangle, which is a two-dimensional polygon with three sides. The term "trihedral" itself means "having three faces". While a trihedral angle is a three-dimensional concept, a related term, "solid angle," describes the three-dimensional angular spread at the vertex of a cone.1234
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