Theorem 1.20-1.23 Tests of Concyclic Points

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  1. Theorem 1.20 Any 3 non-collinear points are concyclic. Only one circle can be drawn passing through them. (.ggb)
     
  2. Theorem 1.21 converse of angles in the same segment (.ggb)
     
  3. Theorem 1.22 opp. angles supp. (.ggb)
     
  4. Theorem 1.23 ext. angle = int. opp. angle (.ggb)