如图,
是⊙D的
圆周,点C在
上运动,求∠BCD的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b19c646bcb6160197fdf12a9cb31a0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b19c646bcb6160197fdf12a9cb31a0d.png)
![](https://img.xkw.com/dksih/QBM/2019/1/2/2109971164332032/2110925324910593/STEM/9f5f2ea58b6248f6b869d032ba28e5e9.png?resizew=136)
更新时间:2018-12-25 08:29:45
|
【知识点】 同弧或等弧所对的圆周角相等解读
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【推荐1】如图,⊙O是△ABD的外接圆,AB为直径.点C是弧AD的中点,连接OC,BC分别交AD于点E,F.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923250273312768/3057968609271808/STEM/0aa7cf3abc924c38be53467e227c0fd4.png?resizew=201)
(1)求证:∠CAD=∠CBA;
(2)若AB=10,BC=8,求OE的长.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923250273312768/3057968609271808/STEM/0aa7cf3abc924c38be53467e227c0fd4.png?resizew=201)
(1)求证:∠CAD=∠CBA;
(2)若AB=10,BC=8,求OE的长.
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名校
【推荐2】如图,
是
的直径,
,
是
的弦,
为弦
的中点,
与
交于点
,过点
作
,交
的延长线于点
,且
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/d543c65e-fd3e-4461-88d4-310158625ee2.png?resizew=134)
(1)求证:
是
的切线;
(2)求证:
;
(3)若
,
,求
的长.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/d543c65e-fd3e-4461-88d4-310158625ee2.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9742d8aa9a0170e0278fe2f814b33fb1.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea147ada4f0aefdd3808a6a1133792eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d89be3b225846e0df0d4262344d974d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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【推荐3】综合与实践
小明在刘老师的指导下开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.小明继续利用上述结论进行探究.
【提出问题】
如图1,在线段
同侧有两点
,
,连接
,
,
,
,如果
,那么
,
,
,
四点在同一个圆上.
探究展示:
【反思归纳】(1)上述探究过程中的横线上填的内容是__________;
【拓展延伸】(2)如图3,在
中,
,
,将
绕点
逆时针旋转得
,连接
交
于点
,连接
、
.小明发现,在旋转过程中,
永远等于
,不会发生改变.
①根据
,利用四点共圆的思想,试证明
;
②在(1)的条件下,当
为直角三角形,且
时,直接写出
的长.
小明在刘老师的指导下开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.小明继续利用上述结论进行探究.
【提出问题】
如图1,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
探究展示:
如图2,作经过点![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 则 ![]() 又∵ ![]() ∴__________, ∴点 ![]() ![]() ![]() ![]() ∴点 ![]() ![]() ![]() ![]() ![]() ![]() ∴点 ![]() ![]() ![]() ![]() |
【拓展延伸】(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246b32e19ae21b0cd1f826c47f517ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d16fab0f52c8af5abba0bf19a06ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
①根据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700d23ec3e0d73c7a576b5f4b3b8a6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3048ae117572e24b27f176b28e89cf.png)
②在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a1219bc313db46b07bbd68600267a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9abe9e42cf396cf527b4ccbd2fefe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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