Cho điểm C di chuyển trên AB, vẽ Cx vuông góc AB. Lấy D và E trên Cx mà ECCB=CACD=√3. Vẽ (I) và (K) đi qua A,C,D và B,C,E chúng cắt nhau tại H.C/m;

a.   B,H D thẳng hàng và A, E, H thẳng hàng

b.   Đường thẳng HC luôn đi qua một điểm cố định 

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