Similarity of triangles

Side bisectors (0)
Angle bisector. Incircle (0)
Perpendicular bisector. perimeter (0)
Heights (0)
The reversal of Thales' theorem (0)
Thales' theorem (0)
Construct triangles (0)
Triangle shapes (0)
Sum of angles in a triangle (0)
Angle at the intersection of straight lines (0)
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