The Polyhedral Angles ClipArt gallery offers 13 images of angles formed by the intersection of three or more planes at a common point. Included are illustrations of dihedral and trihedral angles.

Illustration of a dihedral angle bisected by a plane. "Every point in a plane which bisects a dihedral…

Illustration of a convex polyhedral angle. "The sum of the face angles of any convex polyhedral angle…

Illustration of polyhedral angle. "The opening of three or more planes which meet at a common point…

Trihedral angle. "The sum of any two face angles of a trihedral angle is greater than the third face…

Illustration of 3 equal dihedral angles. "Two dihedral angles have the same ratio as their plane angles."

Illustration used to show that two trihedral angles are equal or symmetrical when the three face angles…