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anhanh0512
1 năm trước
Một máy bay đi từ vị trí A đến vị trí B theo cung nhỏ AB. Với A và B nằm trên đường tròn (O; R). Biết góc AOB = 62 độ, bán kính R=OA=6410 km. Hãy tính độ dài cung AB. (Đơn vị là km và làm tròn đến chữ số thập phân thứ nhất).
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