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im.g.1.17.3 Reflecting on Reflection (10)

Diego says, "I see why a reflection could take RSTU to R'S'T'U', but I'm not sure where the line of reflection is. I'll just guess." 1. How could Diego see that the reflection could work without knowing where the line of reflection is?

2. How could Diego find an exact line of reflection that would work?


Illustrative Mathematics, geometry, unit 1, lesson 17, activity 3, Reflecting on Reflection Licensed under the Creative Commons Attribution 4.0 license,