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

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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