Basic Geometry Definitions

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created 10 years ago by Heidia
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Beginning of a basic geometry definition set
Grade levels:
9th grade, 10th grade
Subjects:
math, geometry
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1

Segment Addition Postulate

Segment Addition Postulate
If B is between A and C, then AB + BC = AC

2

Undefined Terms in Geometry

Point
Line
Plane

3

Point

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

4

Line

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

5

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.

6

Space

The set of all point

7

Collinear

Points that lie on the same line.

8

Non collinear

Points that are not all on the same line

9

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

10

Non coplanar

Not in the same plane

11

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.

12

Line Segment

A part of a line bounded by two end points