如图,
为
的直径,点C为
上一点,过点O作
的垂线分别交
于点E,交
于点D,交过点C的切线于点F,连接
,
,
.
(1)试说明:
.
(2)填空:若
,则
①当
______时,四边形
是平行四边形;
②当
______cm,四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/eb72e8f3-2ae2-4c22-9271-5f621448703b.png?resizew=157)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e779d9ef3281a867c07be504faa142a6.png)
(2)填空:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1138e82e53661e80f00d05bdcd4a4747.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db07c6ce6c8b0e96a3470c6a3491334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ff3ccc1d61e0da8a83fb0e421fd0f1.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
更新时间:2023-05-17 07:51:33
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【推荐1】如图,在
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②如图3,点
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(2)若
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【推荐2】如图,AB是⊙O的直径,AC为弦,点D是弧BC的中点,过点D作⊙O的切线交AC的延长线于点E.
(1)判断DE与AE的位置关系,并说明理由;
(2)求证:AB=AE+CE.
(1)判断DE与AE的位置关系,并说明理由;
(2)求证:AB=AE+CE.
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309760975355904/2314129536663552/STEM/e5973426f1d84130826797548332fbb5.png?resizew=127)
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