如图,点
是以
为圆心,
为直径的半圆上一动点(不与
,
重合),
,连接
并延长至点
,使
,过点
作
的垂线
,分别交
,
,
于点
,
,
,连接
.记
,
随点
的移动而变化.
时,求证:
;
(2)连接
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffc2a946e72f26a8af584d8ead3a396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d80f2addb9f19c08e39b201b226d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01dcbd171693a47c5b932a5e84de10c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f235925a6ec62f5a3ad2832c5c5f8dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1e60bfcff24b362a6257ca1493d8f1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f995b4040810daa4ef4b66039e5b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
2022·四川成都·模拟预测 查看更多[2]
更新时间:2022-05-18 10:51:53
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】(1)如图1,△ABC中,D是BC边上一点,则△ABD与△ADC有一个相同的高,它们的面积之比等于相应的底之比,记为
(△ABD、△ADC的面积分别用记号
、
表示).现有
,则
.
(2)如图2,△ABC中,E、F分别是BC、AC边上一点,且有
,
,AE与BF相交于点G.现作EH∥BF交AC于点H.依次求
、
、
的值.
(3)如图3,△ABC中,点P在边AB上,点M、N在边AC上,且有
,
,BM、BN与CP分别相交于点R、Q.现已知△ABC的面积为1,求△BRQ的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f4f28ab30138e3dc9bb596c76eafac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0d5bb51e91d95ac357f0810a833d7b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1faa0776af3009980d63b4afd48b2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0cf3de61b5492989ae2002e19de770a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b252f6825adde4192b71a8b346e446.png)
(2)如图2,△ABC中,E、F分别是BC、AC边上一点,且有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e4888beedc19b06f5b8f9af92c0651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f884814d3e93eedd9a9a190f2ba7c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9564130d5322b13993a0134735bd10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ed7c60f365a910513d53c166d19fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c762963a2cf0e53d01b7551ce74a9c2f.png)
(3)如图3,△ABC中,点P在边AB上,点M、N在边AC上,且有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b4f46af6dcd0cbf0bb08bd53dc87b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859858e402f5fc0a00b3ac18e352d60b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/13007937-d118-4778-b325-7c5442204222.png?resizew=494)
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【推荐2】如图,在6×6网格里有格点
,仅用无刻度的直尺在给定网格中画图,画图过程用虚线表示,画图结果用实线表示,按步骤完成下列问题:
(1)作
的高AD;
(2)在AC上取一点E,连接DE,使
;
(3)在线段DA上取一点
;
(4)直接写出DE的值__________________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)在AC上取一点E,连接DE,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137c721b8d4ea6dca8b7d9761134726.png)
(3)在线段DA上取一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283c1f7241874001401c89d439d863d4.png)
(4)直接写出DE的值__________________.
![](https://img.xkw.com/dksih/QBM/2021/3/15/2678207606743040/2681138094579712/STEM/35cbffca-bfda-4a2c-a185-9d736aaec85c.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,一个五角星ABCDEFGHIJ,已知A,B,D,E四点共线,A,J,H,G四点共线,C,B,J,I四点共线,C,D,F,G四点共线,E,F,H,I四点共线,且AB=BC=CD=DE=EF=FG=GH=HI=IJ=JA,∠A=∠C=∠DEF=∠FGH=∠I=36°,现测得AB=2cm.
(1)求BJ的长(精确到0.01).
(2)作直线EG,求点A到EG的距离(精确到0.1).
(参考数据:sin36°≈0.5878,cos36°≈0.8090,sin18°≈0.3090,cos18°≈0.9511)
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【推荐2】如图,小明在热气球A上看到正前方横跨河流两岸的大桥BC,并测得B,C两点的俯角分别为60°和30°,已知大桥BC的长度为100m,且与地面在同一水平面上.求热气球离地面的高度.(结果保留根号)
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解答题-证明题
|
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(0.65)
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【推荐1】如图,
是圆O的直径,点
在圆O上,且
平分
.过点D作
的垂线,与
的延长线相交于E,与
的延长线相交于点F.
与圆O相切;
(2)若
,
,求圆O的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72bdba4d53bc0f335d53a30fd354c75b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
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解答题-证明题
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(0.65)
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【推荐2】如图,
是
的外接圆,
是
的直径,F是
延长线上一点,连接
,
,且
是
的切线.
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e26da987786d4d72deef7009af58cd4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5971029fd8805bf3a20929dc1e05254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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