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Adding feet of perpendiculars to triangle

Let's draw a triangle.
And let's add perpendiculars from B and C to the respective opposite sides.
Can a similar triangle be made?
Or can you make a similar triangle to ĢABC based on this figure?


  1. : It is good to explore with freehand.
  2. : Drawing by tool and exploring with moving
  3. : Bonus?

Forum of Geometric Constructor by Y.Iijima