Bài 1: Cho tam giác ABC các góc nh?n, n?i ti?p trong ???ng tròn (O). Hai ???ng cao BD và CE c?t nhau t?i H. a) Ch?ng minh các t? giác ADHE, BEDC n?i ti?p ???c b) Ch?ng minh góc EAH b?ng góc ECB c) T? A k? ti?p tuy?n xy v?i ???ng tròn. Ch?ng minh xy // DE
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In quadrilateral ADHE, we have: ∠DAH + ∠DEH = 180° (opposite angles in a cyclic quadrilateral) In quadrilateral BEDC, we have: ∠BEC + ∠BDC = 180° (opposite angles in a cyclic quadrilateral) Show more…
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