Ruler and Compass Construction 25
Mirror Reflection of a Point in a Line

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1. Arbitrary point A on the line
2. Arc centered at A, through C
3. Arbitrary point B on the line
4. Arc centered at B, through C
5. Mirror point D
The mirror image of C is a point on the perpendicular to the mirror at equal distance on the other side of the mirror, and the perpendicular-to-a-line construction gives that.
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