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# Geometry Terms

### definitions

TermDefinition
Undefined Terms Words, usually readily understood, that are not formally explained by means of more basic words and concepts. The basic undefined terms of geometry are point, line and plane.
Length The measurement of an object from point A to point B.
Polygon Closed figure formed by a finite number of coplanar segments called sides such that the following conditions are met: 1. The sides that have a common endpoint are noncollinear. 2. Each side intersects exactly two other sides, but only at the vertices.
Reflection A transformation representing the flip of a figure over a point, line or plane. When in a line it is a function that maps a point to its image compared to its pre-image.
Translation A transformation that moves a figure the same distance in the same direction. This function maps each point to its image along a vector so each segment joining a point and its image has the same length as the vector, and is also parallel to the vector.
Rotation A transformation that turns every point of a pre-image through a specified angle and direction about a fixed point, called the center of rotation.
Symmetry When there exists a rigid motion--reflection, translation, rotation or glide reflection--that maps the figure onto itself.
Compositions of Transformation The resulting transformation when a transformation is applied to a figure and then another transformation is applied to its image.
Congruence A mapping for which a geometric figure and its image are congruent.
Created by: user-1566191
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