Google Classroom
GeoGebraClasse GeoGebra

Theorem 1.20-1.23 Tests of Concyclic Points

Theorem 1.20 Any 3 non-collinear points are concyclic. Only one circle can be drawn passing through them.

Theorem 1.21 converse of angles in the same segment

Theorem 1.22 opp. angles supp.

Theorem 1.23 ext. angle = int. opp. angle