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6.12: Recognizing Reflections

Difficulty Level: At Grade Created by: CK-12
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Coordinate Notation

A coordinate point is the description of a location on the coordinate plane. Coordinate points are commonly written in the form (x, y) where x is the horizontal distance from the origin, and y is the vertical distance from the origin.

Coordinate Plane

The coordinate plane is a grid formed by a horizontal number line and a vertical number line that cross at the (0, 0) point, called the origin. The coordinate plane is also called a Cartesian Plane.

Geometric Patterns

Geometric patterns are visual patterns of geometric figures that follow a rule.


The image is the final appearance of a figure after a transformation operation.

perpendicular bisector

A perpendicular bisector of a line segment passes through the midpoint of the line segment and intersects the line segment at 90^\circ.

Perpendicular lines

Perpendicular lines are lines that intersect at a 90^{\circ} angle.


The pre-image is the original appearance of a figure in a transformation operation.


A reflection is a transformation that flips a figure on the coordinate plane across a given line without changing the shape or size of the figure.


A transformation moves a figure in some way on the coordinate plane.

Rigid Transformation

A rigid transformation is a transformation that preserves distance and angles, it does not change the size or shape of the figure.

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Difficulty Level:
At Grade

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Date Created:
Jan 23, 2013
Last Modified:
Aug 11, 2016
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