Reflection:
A reflection is a transformation that flips a figure across a line.
Properties of reflection:
• The length remains the same, the angles remain the same.
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• This means that the image and the pre-image have the same size and shape only the orientation changes.
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• The line segment which connects the corresponding parts of the image and pre-image is perpendicular to the line of reflection.
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• The distance from the line of reflection of the corresponding parts of the image and pre-image is the same.
Following is an example of a reflection
This is called a horizontal reflection since the image and the pre-image is flipped across the x-axis. The line of reflection is the vertical line.