When two half-planes meet along a common line they form a dihedral angle. To measure it one reduces the problem to the plane by means of the normal section. A classic example is the dihedral angle between an oblique face and the base of a cube.
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When two half-planes meet along a common line they form a dihedral angle. To measure it one reduces the problem to the plane by means of the normal section. A classic example is the dihedral angle between an oblique face and the base of a cube.