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The Collaborative International Dictionary
Plane angle

Plane \Plane\, a. [L. planus: cf. F. plan. See Plan, a.] Without elevations or depressions; even; level; flat; lying in, or constituting, a plane; as, a plane surface.

Note: In science, this word (instead of plain) is almost exclusively used to designate a flat or level surface.

Plane angle, the angle included between two straight lines in a plane.

Plane chart, Plane curve. See under Chart and Curve.

Plane figure, a figure all points of which lie in the same plane. If bounded by straight lines it is a rectilinear plane figure, if by curved lines it is a curvilinear plane figure.

Plane geometry, that part of geometry which treats of the relations and properties of plane figures.

Plane problem, a problem which can be solved geometrically by the aid of the right line and circle only.

Plane sailing (Naut.), the method of computing a ship's place and course on the supposition that the earth's surface is a plane.

Plane scale (Naut.), a scale for the use of navigators, on which are graduated chords, sines, tangents, secants, rhumbs, geographical miles, etc.

Plane surveying, surveying in which the curvature of the earth is disregarded; ordinary field and topographical surveying of tracts of moderate extent.

Plane table, an instrument used for plotting the lines of a survey on paper in the field.

Plane trigonometry, the branch of trigonometry in which its principles are applied to plane triangles.

Wiktionary
plane angle

n. 1 (context geometry English) An angle formed by two intersecting straight lines. 2 (context geometry English) An angle formed by two intersecting planes, measured by the angle between two intersecting straight lines that are in respective planes and perpendicular to the intersection of the planes.

WordNet
plane angle

n. an angle formed by two straight lines (in the same plane)

Usage examples of "plane angle".

Storing extra oxygen and synthetic foods aboard a jet boat, Willard and Lister set the controls of their bulky freighter at a thirty degree up-plane angle and sent it, unmanned, in a million-mile orbit, while they blasted off in the jet boat.