Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Câu 31: Cho tam giác ABC cân có cạnh bênh bằng b và nội tiếp đường tròn (O;R).
a. Tính Côsin của các góc tam giác.
b. Tính bán kính dường tròn nội tiếp tam giác.
c. Với giá trị nào của b thì tam giác có diện tích lớn nhất.
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 10:41 PM
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