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c.ngocbinh
2 năm trước
Cho tam giác ABC vuông tại A (AB < AC), có đường cao AH và đường trung tuyến AM (H, M ∈ BC). 1) Cho AB = 6; BC = 10. Tính BH và sinACB. 2) Gọi D là điểm đối xứng của A qua M. Chứng minh rằng: CD ² = BH.BC; Giúp mình với đang cần gấp lắm ạ !!!
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