David Little
Mathematics Department
Penn State University
Eberly College of Science
University Park, PA 16802
Office: 403 McAllister
Phone: (814) 865-3329
Fax: (814) 865-3735
e-mail:dlittle@psu.edu

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Reflection of a Point Across a Line
Our goal will be to draw the mirror image of the blue point across the line through the read and green first.

First, draw circle centered at the red point that goes through the blue point. Second, draw a circle centered at the green point that goes through the blue point.

The two circles you have just constructed intersect in exactly two places. One place of intersection is of course the blue point. The other point of intersection is the reflection of the blue point across the given line.