##### Basic Geometry Definitions

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created 10 years ago by Heidia
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Beginning of a basic geometry definition set
Subjects:
math, geometry
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If B is between A and C, then AB + BC = AC

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Undefined Terms in Geometry

Point
Line
Plane

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Point

A point has no length or width, it just specifies an exact location

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Line

A line is a straight one-dimensional figure having no thickness and extending infinitely in both directions.

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Plane

In geometry, a plane is a flat two-dimensional "surface" (similar to a sheet of paper, but with no thickness and no finite length or width). A plane is defined by three points, each of which forms a line with the other two points within the plane.

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Space

The set of all point

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Collinear

Points that lie on the same line.

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Non collinear

Points that are not all on the same line

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Coplanar

a set of points in space is coplanar if all the points lie in the same geometric plane. For example, three distinct points are always coplanar; but a fourth point or more added in space can exist in another plane

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Non coplanar

Not in the same plane

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Ray

A ray is a part of a line that begins at a particular point (called the endpoint) and extends endlessly in one direction. A ray is also called half-line.

Ray
A ray is the part of the line which consists of the given point and the set of all points on one side of the end point.

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Line Segment

A part of a line bounded by two end points