Two circles are drawn, one with center A and one with center B.
Use what you have learned to prove that theTwo circles are drawn, one with center A and one with center B.
Use what you have learned to prove that the obtuse triangles ΔECA, ΔFCB, ΔFDB and ΔEDA are congruent. obtuse triangles ΔECA, ΔFCB, ΔFDB and ΔEDA are congruent.