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山东省德州市2019年中考数学一轮复习第六章圆第20讲与圆有关的位置关系（过预测）练习.doc

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1与圆有关的位置关系考向 切线的性质与判定12018南通如图， AB为 O的直径， C为 O上一点， AD和过点 C的切线互相垂直，垂足为 D，且交 O于点 E.连接 OC， BE，相交于点 F.(1) 求证： EF BF. (2) 若 DC4， DE2，求直径 AB的长222018孝感如图， ABC中， AB AC，以 AB为直径的 O交 BC于点 D，交 AC于点E，过点 D作 DF AC于点 F，交 AB的延长线于点 G.(1) 求证： DF是 O的切线；(2) 已知 BD2 ， CF2，求 AE和 BG的长53

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