dihedral angle

American  

noun

Geometry.

1. the angle between two planes in a dihedron.

2. dihedron.

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Etymology

Origin of dihedral angle

First recorded in 1820–30

Example Sentences

The two wings of a bird would constitute a monoplane, when they are in a horizontal position for soaring, or when the tips are uplifted and they form an angle like a broad V, called a dihedral angle.

From Project Gutenberg

At this point in Book VI it is customary to introduce the dihedral angle.

From Project Gutenberg

It is not necessary to dwell at length upon the dihedral angle, except to show the analogy between it and the plane angle.

From Project Gutenberg

The locus of a point equidistant from the faces of a dihedral angle is the plane bisecting the angle.

From Project Gutenberg

This at once suggests that there are two planes in the locus, provided the planes of the dihedral angle are taken as indefinite in extent, and that these planes are perpendicular to each other.

From Project Gutenberg