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Reflecting in Parallel Lines

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translate blue-green line
-0.5
translate green-red line
0.5
blue-to-green lines
green-to-red lines
Reflect the blue triangle in the blue-green line to form the green image. Reflect the green triangle in the green-red line to form the red image. The red triangle, being reflected twice, is oriented like the blue triangle.
Ignoring the green triangle, the result of the two reflections is to translate the blue triangle to the red triangle through twice the distance between the two mirror lines.
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