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Plane 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.

Plane ta·ble See under Plane, a.

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From: WordNet (r) 2.0

plane table

n : surveying instrument consisting of a drawing board and a

ruler that are mounted on a tripod; used to sight and map

topographical details