Mathematics, 27.09.2021 21:40 maliyahsanmiguel
Cho đường tròn (O) đường kính AB, vẽ góc ở tâm AOC=50° với C nằm trên (O) vẽ dây CD vuông góc với AB và dây DE song song với ABa, Tính số đo cung nhỏ BEb, Tính số đo cung CBE. Từ đó suy ra ba điểm C, O, E thẳng hàng
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Cho đường tròn (O) đường kính AB, vẽ góc ở tâm AOC=50° với C nằm trên (O) vẽ dây CD vuông góc với AB...
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