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nguyenvuquangphu11
2 năm trước
Cho tg ABC có góc A bằng 60 độ, góc B gấp 2 lần góc C a) so sánh các cạnh tg ABC b) Tia phân giác góc A cắt BC tại I . Gọi H và K lần lượt là hình chiếu của I trên AB và AC. chứng minh IH = IK c) Lấy điểm E trên cạnh AC sao cho AE =AB. Chứng minh tg EIC cân Làm gấp giúp mik với ạ :)))
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