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nguyenvananh1996vp
2 năm trước
Cho xBy =70° .Trên tia Bx lấy điểm A(A khác B),trên tia By lấy điểm C (C khác B ) .Gọi M là trung điểm của AC.Qua A kẻ đường thẳng song song với By cắt tại BM tại D a) Chứng minh ∆AMD = ∆CMB. b) Chứng minh AB = DC c) Kẻ BH vuông góc với AD (H nằm trên tia DA).Tính HBx Giúp mk nha các bạn!!!
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