Ruler and Compass Construction 7
Copy Angle A to Given Segment DE

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1. Circle centered at A, arbitrary radius
2. Circle centered at D, same radius
3. Circle centered at H, radius FG
4. Side DI of copied angle
Why it works: AF = DH and AG = DI by using the same radius for the two arcs. And FG = HI, so AFG is congruent to DHI by SSS, so angle A equals angle D.
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