如图,AB是⊙O的直径,点C,D在⊙O上,且AD平分∠CAB,过点D作AC的垂线,与AC的延长线相交于点E,与AB的延长线相交于点P.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942434653298688/2943679852273664/STEM/a96a65cde36a4db4802223aeb2d3851b.png?resizew=188)
(1)求证:EP与⊙O相切;
(2)连结BD,求证:AD·DP=BD·AP
(3)若AB=6,AD=
,求DP的长.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942434653298688/2943679852273664/STEM/a96a65cde36a4db4802223aeb2d3851b.png?resizew=188)
(1)求证:EP与⊙O相切;
(2)连结BD,求证:AD·DP=BD·AP
(3)若AB=6,AD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
更新时间:2022-03-25 09:14:54
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解答题-证明题
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【推荐1】【基础巩固】
(1)如图①,在
中,
,
,点D为
延长线上一点,连接
,将线段
绕点A逆时针旋转
得到线段
,连接
.求证:
;
【尝试应用】
(2)如图②,在(1)的条件下,连接
交
于点F,若
,
,求线段
的长;
【拓展提高】
(3)如图③,在正方形
中,点E是对角线
延长线上的一点,连接
,将
绕点D逆时针旋转
得到线段
交
于点F,交
于点G,连接
.若
,
,直接写出
的长.
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
【尝试应用】
(2)如图②,在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c82889763b8746388c4e8fb570e30d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85356332bda04252ec31d64c41d0f3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【拓展提高】
(3)如图③,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff20d6bc773444111e4df4fc3f55482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28622510f332a76a2d2883a34a6e248f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】如图,四边形ABCD中,
,E是边CD的中点,连接BE并延长与AD的延长线相较于点F.
(2)若△BCD是等腰三角形,求四边形BDFC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d63a1cc9d09c8788bac51114174ef5a5.png)
(2)若△BCD是等腰三角形,求四边形BDFC的面积.
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【推荐1】如图在
中,
,
,点P在
边上,D、E分别为
、
的中点,连接
,过点E作
的垂线,与
、
分别交于F、G两点,连接
交
于点H.
(1)
的度数为
(2)猜想
与
的关系,并证明;
(3)连接
,设
,
的面积为y,求y关于x的函数关系式;
(4)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f138deab9e5a4baaada287ed1a78df9.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/4d7c4855-da03-4362-a829-6b60007b13ea.png?resizew=415)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ea820cf3732508cdd332ceb9395ce.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1269ea1057c555e256a8ea4a717e0f0.png)
(4)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a920b809ab321817128e7ba83bab143.png)
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解答题-作图题
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【推荐2】如图,
是半圆
的直径,点
是半圆上一点(不与点
,
重合),连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/f415d167-f76a-4efe-b045-a39f7af9a9d5.png?resizew=332)
(1)请在图1中用无刻度的直尺和圆规作出
的平分线,交半圆
于点
.(保留作图痕迹,不写做法)
(2)如图2,在(1)的条件下,过点
作半圆的切线,交
的延长线于点
,作
于点
,连接
.
①求证:
.
②若
,
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/f415d167-f76a-4efe-b045-a39f7af9a9d5.png?resizew=332)
(1)请在图1中用无刻度的直尺和圆规作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)如图2,在(1)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64801659b870d51fc18d5db7f0567e66.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee498e34b21dea01638f5c6adccb3561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
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【推荐1】如图,
是
的内接三角形,点
,
分别在直径
,弦
上,点
在线段
的延长线上,连接
.
①
;②
;③
是
的切线.
你选择的补充条件是_________,结论是_________;(填写序号)
(2)在(1)的条件下,若
,
,
.
①求
,
的长;②求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab618c936da03808cb9953783d42b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
你选择的补充条件是_________,结论是_________;(填写序号)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d9855bf67d6e1998a754da17a1c12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4cf04a9d6296887c8ca1f1b1bd61d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2adc8e8cbd75e60994cc5652728c7dc.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】已知:如图,Rt△ABC中,∠ABC=90°,AD平分∠BAC交BC于D.
(1)用尺规作⊙O,使⊙O过A、D两点,且圆心O在AC上.(保留作图痕迹,不写作法)
(2)求证:BC与⊙O相切;
(3)设圆O交AB于点E,若AE=2,CD=2BD.求线段BE的长和弧DE的长.
(1)用尺规作⊙O,使⊙O过A、D两点,且圆心O在AC上.(保留作图痕迹,不写作法)
(2)求证:BC与⊙O相切;
(3)设圆O交AB于点E,若AE=2,CD=2BD.求线段BE的长和弧DE的长.
![](https://img.xkw.com/dksih/QBM/2017/9/25/1781763603095552/1782516160790528/STEM/af670728d64245dfac66357400e4b433.png?resizew=185)
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【推荐1】如图,已知二次函数
的图象交x轴于点
,
,交y轴点A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/a824bc66-0643-453e-8685-ffb8583d4470.png?resizew=188)
(1)求二次函数
的表达式;
(2)连接AC,AB,若点P在线段BC上运动(不与点B,C重合),过点P作PD//AC,交AB于点D,试猜想
的面积有最大值还是最小值,并求出此时点P的坐标.
(3)连接OD,在(2)的条件下,求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1a89c495be618bca7c4e6af85ba8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a9f4e4a36cc4b41d4818b884cfa895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70b7ee9e3407dea9aed44f2db4104c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/a824bc66-0643-453e-8685-ffb8583d4470.png?resizew=188)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1a89c495be618bca7c4e6af85ba8ec.png)
(2)连接AC,AB,若点P在线段BC上运动(不与点B,C重合),过点P作PD//AC,交AB于点D,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
(3)连接OD,在(2)的条件下,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defb2f1e87246eaaa57acb11c8b731fb.png)
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【推荐2】如图,已知AB是⊙O的直径,弦CD⊥AB于E,过C点的切线交AB的延长线于P,过P点作PF∥CD交CB的延长线于F.
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915778572288/1573915784806400/STEM/700470b0a1ac45f9b0a91a41c2214174.png)
(1)求证:PC=PF;
(2)当PO=5,BF=2
时,求⊙O的半径和CB的长.
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915778572288/1573915784806400/STEM/700470b0a1ac45f9b0a91a41c2214174.png)
(1)求证:PC=PF;
(2)当PO=5,BF=2
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915778572288/1573915784806400/STEM/d9d5cfee7f964ef2b4109058c1ca8311.png)
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