Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 39: CHo tứ giác lồi ABCD, gọi α là góc hợp bởi hai dường chéo AC và BD. CHứng minh diện tích S của tam giác cho bởi công thức: S=1/2.AC.BD.sinα
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 10:56 PM
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