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Thudongdang22
2 năm trước
Bài 5: Cho tam giác ABC có 0B 60 , các hình chiếu vuông góc của AB và AClên BC theo thứ tự bằng 12 và 18. Tính các góc và đường cao của tam giác ABC. Bài 6: Cho hình thang ABCD, có 0A D 90 , đáy nhỏ AB = 4, đáy lớn CD = 8, AD = 3. Tính BC;B;C?
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