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1、2.1 直线与圆的位置关系一选择题（共 6 小题）1如图，P为圆 O 外一点，OP交圆 O 于 A 点，且 OA=2AP甲、乙两人想作一条通过P 点且与圆 O 相切的直线，其作法如下：（甲）以 P为圆心，OP 长为半径画弧，交圆O 于 B 点，则直线 PB即为所求；（乙）作 OP的中垂线，交圆 O 于 B 点，则直线 PB 即为所求对于甲、乙两人的作法，下列判断何者正确？（）A两 人皆 正确B两 人皆 错误C甲 正确，乙 错误D甲 错误，乙 正确2如图，AB 是O 的直径，BC 交O 于点 D，DEAC 于点 E，要使 DE 是O 的切线，还需补充一个条件，则补充的条件不正确的是（）ADE=D
2、O BAB=AC CCD=DB DACOD 3如图，在O 中，E 是半 径 OA 上一点，射线 EFOA，交圆于 B，P为 EB 上任一点，射线 AP交圆于 C，D 为射线 BF上一点，且 DC=DP，下列结论：CD 为O 的切线；PAPC；CDP=2A，其中正确的结论有（）A3个B2个C1个D0 个4如图，已知 AB、AC 分别是 O 的直径和弦，D 为的中点，DE垂直于 AC 的延长线于点 E，连结 BC，若 DE=6cm，CE=2cm，下列结论错误的是（）ADE是 O的切线B直径 AB 长为 20cm C弦 AC 长为16cm DC 为弧AD的三等分点5如图 ABC 是O 内接三角形，下
3、列选项能使过点A 的直线 EF与O 相切于点 A 的条件是（）A.EAB=C B.B=90 C.EFAC D.AC 是O 直径6如图，ABC 中，AB=AC，以 AB 为直径的 O 交 AC 于 E，交BC 于 D，DFAC 于 F给出以下五个结论：BD=DC；CF=EF；弧 AE=弧 DE；A=2FDC；DF 是O 的切线其中正确的有（）文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编
4、码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y
5、5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P
6、1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A
7、6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H
8、3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B
9、10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P
10、8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1A5个B4个C3个D2 个填空题（共 4 小题）7（2012?湘潭）如图，ABC 的一边 AB 是O 的直径，请你添加一个条件，使 BC 是O 的切线，你所添加的条件为_8如图，点 A、B、D 在O 上，A=25，OD 的延长线交直线BC于点 C，且OCB=40，直线 BC 与O 的位置关系为_9（2011?江西模拟）如图，CD 是O 的直径，BD 是弦，延长DC到 A，使 ABD=120，若添加一个条件，使AB 是O 的
11、切线，则下列四个条件：AC=BC；AC=OC；OC=BC；AB=BD中，能使命题成立的有_（只要填序号即可）10如图，O 的半径为 3cm，B 为O 外一点，OB 交O于点 A，AB=OA，动点 P 从点 A 出发，以 cm/s 的速度在 O 上按逆时针方向运动一周回到点A 立即停止当点P运动的时间为_s时，BP 与O 相切三解答题（共 10 小题）11（2014?宿迁）如图，AB 是O 的弦，OPOA 交 AB 于点 P，过点 B 的直线交 OP的延长线于点 C，且 CP=CB（1）求证：BC 是O 的切线；（2）若O 的半径为，OP=1，求 BC 的长文档编码:CQ8Y5A1X8P1 HQ
12、8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S
13、1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX
14、5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F1
15、0P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文
16、档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ
17、8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X
18、8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y112（2014?白银）如图，RtABC 中，ABC=90，以 AB 为直径作半圆 O 交 AC与点 D，点 E 为 BC 的中点，连接DE（1）求证：DE是半圆 O 的切线（2）若BAC=30，DE=2，求
19、 AD 的长13（2014?钦州）如图，点 B、C、D 都在半径为 6 的O 上，过点 C 作ACBD 交 OB 的延长线于点 A，连接 CD，已知 CDB=OBD=30（1）求证：AC 是O 的切线；（2）求弦 BD 的长；（3）求图中阴影部分的面积14如图，AB 是O 的直径，点 F，C 是O 上两点，且=，连接 AC，AF，过点 C 作 CDAF 交 AF 延长线于点 D，垂足为 D文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8
20、A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1
21、H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5
22、B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10
23、P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档
24、编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8
25、Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8
26、P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1（1）求证：CD 是O 的切线；（2）若 CD=2，求 O 的半径15（2014?鄂州）如图，以 AB 为直径的 O 交BAD 的角平分线于C，过 C 作 CDAD 于 D，交 AB 的延长线于 E（1）求证：CD 为O 的切线（2）若=，求 cosDAB16（2014?本溪）如 图，已 知 在RtABC中，B=30，ACB=90，延长 CA 到 O，使AO=AC，以 O
27、为圆心，OA 长为半径作 O 交 BA 延长线于点 D，连接 CD（1）求证：CD 是O 的切线；（2）若 AB=4，求图中阴影部分的面积文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A
28、6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H
29、3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B
30、10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P
31、8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编
32、码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y
33、5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y117（2014?达州）如图，直
34、线PQ 与O 相交于点 A、B，BC 是 O的直径，BD 平分CBQ 交O 于点 D，过点 D 作 DEPQ，垂足为E（1）求证：DE 与O 相切；（2）连结 AD，己知 BC=10，BE=2，求 sinBAD 的值18如图，在菱形 ABCD 中，P 是对角线 AC 上的一点，且 PA=PD，O 为APD 的外接圆（1）试判断直线 AB 与O 的位置关系，说明理由；（2）若 AC=8，tanDAC=21，求 O 的半径19如图，AB 是O 的直径，AC 是弦，BAC 的平分线 AD 交 O于点 D，DEAC，交 AC 的延长线于点 E，OE 交 AD 于点 F（1）求证：DE 是O 的切线；文
35、档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ
36、8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X
37、8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ
38、8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S
39、1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX
40、5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F1
41、0P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1（2）若O 的半径 OA=5，弦 AC 的长是 6求 DE 的长；请直接写出的值20如图，已知等边 ABC，以边 BC 为直径的半圆与边AB，AC分别交于点 D，点 E，
42、过点 D 作 DFAC，垂足为点 F（1）判断 DF 与O 的位置关系，并证明你的结论；（2）过点 F 作 FHBC，垂足为点 H若等边 ABC 的边长为 4，求 FH 的长（结果保留根号）文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F1
43、0P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文
44、档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ
45、8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X
46、8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ
47、8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S
48、1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1文档编码:CQ8Y5A1X8P1 HQ8A6Q7S1H3 ZX5B10F10P8Y1