A generalization Brianchon's theorem

Let A1,A2,A3,A4,A5,A6 lie on a circle (O). Let A be a point on the plane. The perpendicualar of AAi at Ai meets the perpendicular of AAi+1 at Ai+1 at Bi, A7≡A1. Then B1B4,B2B5,B3B6 are concurrent

 

Đào Thanh Oai

 
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