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Mathematics, 22.07.2021 14:00 littledudefromacross

Gọi I là trung điểm của dây cung AB không qua tâm của đường tròn (O; R). Qua I vẽ dây cung CD. a) Chứng tỏ CD = AB. Tìm độ dài nhỏ nhất, lớn nhất của các dây quay quanh I. b) Cho R = 5cm, OI = 4cm. Tính độ dài dây cung ngắn nhất qua I. c) Chứng tỏ rằng : OAI > ODI. 2.​

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Gọi I là trung điểm của dây cung AB không qua tâm của đường tròn (O; R). Qua I vẽ dây cung CD. a) Ch...
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