Có một cái cốc làm bằng giấy, được úp ngược như hì...
Câu hỏi: Có một cái cốc làm bằng giấy, được úp ngược như hình vẽ. Chiều cao của cốc là 20cm, bán kính đáy cốc là 4cm, bán kính miệng cốc là 5cm. Một con kiên đang đứng ở điểm A của miệng cốc dự định sẽ bò hai vòng quanh thân cốc để lên đến đáy cốc ở điểm B. Quãng đường ngắn nhất để con kiến có thể thực hiện được dự định của mình gần đúng nhất với kết quả nào dưới đây: ![](data:image/png;base64,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)
A \(l\approx 58,67cm\)
B \(l\approx58,80cm\)
C \(l\approx 59,98cm\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán trường THPT Chuyên Nguyễn Trãi - Hải Dương - lần 2 - năm 2017 ( có lời giải chi tiết)