The wings on modern commercial aircraft are attached to the plane at a slight angle known as a dihedral. This angle allows the plane to achieve the lift it needs to fly, and at the proper angles, ...

In mathematics, a dihedral group is the group of symmetries of a regular polygon, including both rotations and reflections. What is a dihedral group? In mathematics, a dihedral group is the group of ...

Demonstrate that if two trihedral angles have dihedral angles respectively equal, then their face angles are equal. For 15 years Columbia’s Dean Herbert Edwin Hawkes has dangled this poser before his ...