High Quality Content by WIKIPEDIA articles! A spherical angle is a particular dihedral angle; it is the angle between two intersecting arcs on a sphere, and is measured by the angle between the planes containing the arcs (which would naturally also contain the centre of the sphere).In geometry, the angle between two planes is called their dihedral or torsion angle.A dihedral angle can be signed; for example, the dihedral angle ?AB can be defined as the angle through which plane A must be rotated (about their common line of intersection) to align it with plane B. Thus, ?AB = ? ?BA. For precision, one should specify the angle or its supplement, since both rotations will cause the planes to coincide.

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