[Top], [画像一覧], [一覧], (GC World : Various Problems ,Constant)

Angle of corner

Let's move point A.
What will the angle of ∠XAP change?
With which movement will the angle of ∠XAP not change?
With which movement will the angle of ∠XAP change?

GC/Win


  1. : To equate two triangles
  2. : To equate many angles
  3. : Confirming (1)
  4. : Confirming (2)
Forum of Geometric Constructor by Y.Iijima