已知:四边形
内接于⊙O,连接
.
(1)如(图1),求
的值;
(2)如(图2),
的平分线交
于E,交
延长线于F,求证:
;
(3)如(图3),在(2)的条件下,若
的周长为16,
与
周长的差为5,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65a5486de7e81b58201704f27b675a5.png)
(1)如(图1),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4600275dda575e545cab0145d9480d.png)
(2)如(图2),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff56ea00ca90825f3d95809de24f639.png)
(3)如(图3),在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0470fb0c8c3a5a07f1ed4b79d4126e96.png)
![](https://img.xkw.com/dksih/QBM/2020/12/15/2614743209689088/2619562379444224/STEM/295b654b-60a9-42b4-8e1f-5bfc34074251.png)
更新时间:2020-12-22 10:56:12
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图1,把
AOB放置在平面直角坐标系中,点O为坐标原点,点A的坐标为(6,6),点B的坐标为(8,0),AH是OB边上的高线,P是线段OB上一动点(点P与点O,H.B均不重合),过A,P,H三点的外接圆分别交AO,AB于点C,D.
(1)求OA的长及tan∠BAH的值;
(2)如图2,连接CD,当CD∥OB时,
①求CD的长;
②求点P的坐标;
(3)当点P在线段OB上运动时,
AD的值是否发生变化?若不变,请求出该定值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求OA的长及tan∠BAH的值;
(2)如图2,连接CD,当CD∥OB时,
①求CD的长;
②求点P的坐标;
(3)当点P在线段OB上运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d7e7bd99635f282a4d043bac948dae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/8ff8aee4-eb48-462a-98e1-b5ad28a11288.png?resizew=512)
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解答题-问答题
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困难
(0.15)
【推荐2】如图,两个正方形
与
,
与
的中点都是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/9cc456db-f3aa-4cc2-8373-22b04c43dde6.png?resizew=392)
(1)如图1,点
与
重合.
①求
的值;
②连结
,求
的值.
(2)如图2,若
,在正方形
绕点
旋转过程中,以
,
,
为顶点的三角形能否是等腰三角形?若能,直接写出该三角形面积;若不能,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/9cc456db-f3aa-4cc2-8373-22b04c43dde6.png?resizew=392)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0286d0c84b5d2c87158aa2e90ef964.png)
②连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c199401352eca83621645ea7f96d6d.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0752548f887e3d5564fa1bdba679f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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解答题-证明题
|
困难
(0.15)
【推荐1】如图,AB、AC是⊙O的两条弦,BO的延长线交AC于点D,连接OA、OC.若
,则:
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074869082398720/3076934881820672/STEM/8e9e0cf032924bc58fd1cfcab2fe4e17.png?resizew=146)
(1)求证:
;
(2)当
时,求∠BAC;
(3)若
,且△AOB面积为2,求△AOD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d824de2c1dcdcd4b9f7ab0982f0cee2d.png)
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074869082398720/3076934881820672/STEM/8e9e0cf032924bc58fd1cfcab2fe4e17.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
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(0.15)
名校
解题方法
【推荐2】已知,
内弦
、
交于点E,
,连接
.
(1)如图1,求证:
平分
;
(2)如图2,连接
交
于点G,延长
交
于点F,连接
,若
,求证:
;
(3)如图3,在(2)的条件下,延长
交
于点H,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/084e0acf-f2ac-4dba-aef6-1771e121f792.png?resizew=428)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e5888c98e8e9e59ded39e5a61097c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf79b050df52274a0ad72baee610172f.png)
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af008afff98efa3b081aa97c173566c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf7aab0f06807762d312445c607f615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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