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Question about 6.28 II-A Geometry

 
 
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Re: Question about 6.28 II-A Geometry
ProfessorAreteem - 2021年07月12日 Monday 14:18
 

This is because $DE$ and $FG$ are parallel to $BC$. The parallelnes of the segments gives you angles of the same size, so by AA the triangles are similar.