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Jenny11
2 năm trước
Giúp mk gấp! VOte 5 sao đầy đủ ạ! Không spam nha! Cho tam giác ABC có AB = 6cm, góc B = 45 độ, góc C = 30 độ. Kẻ đường cao AH (H thuộc BC) a) Tính AH, AC, SABC b) Gọi M, N lần lượt là hình chiếu của H trên cạnh AB, AC. C/M rằng: SAMN = sin ²B. sin ²C.SABC
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