如图,
为
的切线,点
为
上一点,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/8f271c48-cdd8-4d10-8f8b-c9f480dc3961.png?resizew=167)
(1)求证:
;
(2)若
,
,试求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/f3a037c23a11c7783b1b44988c21634f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/8f271c48-cdd8-4d10-8f8b-c9f480dc3961.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6871e0a6c46c10e6be02f7e8d5bf6ced.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ae98eb223b4fe33e53e9d3ba4cc40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc20bd4ed195e3a8e91d69e6b468762.png)
更新时间:2022-01-28 13:46:09
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】几何证明:
(1)已知:如图1,BD、CE分别是△ABC的外角平分线,过点A作AF⊥BD,AG⊥CE,垂足分别是F、G,连接FG,延长AF、AG,与直线BC相交.求证:FG=
(AB+BC+AC).
(2)若BD、CE分别是△ABC的内角平分线,其余条件不变(如图1),线段FG与△ABC的三边又有怎样的数量关系?写出你的猜想,并给予证明.
(1)已知:如图1,BD、CE分别是△ABC的外角平分线,过点A作AF⊥BD,AG⊥CE,垂足分别是F、G,连接FG,延长AF、AG,与直线BC相交.求证:FG=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)若BD、CE分别是△ABC的内角平分线,其余条件不变(如图1),线段FG与△ABC的三边又有怎样的数量关系?写出你的猜想,并给予证明.
![](https://img.xkw.com/dksih/QBM/2019/1/25/2126309694046208/2128530575998976/STEM/75710fd9aeb24359893484e9373fd732.png?resizew=422)
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【推荐2】在长方形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/1d86f66d-2e72-4759-8ea1-d9bd207d2d89.png?resizew=461)
(1)如图1,P为
边上一点,将
沿直线
翻折至
的位置,其中点Q是点B的对称点,当点Q落在
边上时,请你直接写出
的长为_______.
(2)如图2,点E是
边上一动点,过点E作
交
边于点F,将
沿直线
翻折得
,连接
,当
是以
为腰的等腰三角形时,求
的长;
(3)如图3,点M是射线
上的一个动点,将
沿
翻折,其中点A的对称点为
,当
,M,C三点在同一直线上时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/529188246973b6851b114466a238fc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e096f87473d0b6b6d531ba22e5a7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8a4e3c2dd175589c347f0a296300f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/1d86f66d-2e72-4759-8ea1-d9bd207d2d89.png?resizew=461)
(1)如图1,P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
(2)如图2,点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9272e76d70b87882b81823e5de53bc14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da650ee630c36fd5ce9abb4fb826df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4851109ebad7d40fd6e8c0ed91cde6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)如图3,点M是射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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【推荐3】已知:如图在平面直角坐标系中,O为坐标原点,A、B分别是y轴正半轴和x轴正半轴上的点,OA=OB=a,a满足等式2a﹣2×16=64.
(1)求点A的坐标;
(2)动点C从O点出发沿x轴负半轴方向匀动,速度为每秒2个单位长度,过点B作BD⊥AC于D,交y轴于点E,设C的运动时间为t,用含t的代数式表示线段AE的长.
(3)在(2)的条件下过点O作OF⊥BD于点F,交AB于点G,连接EG,是否存在t值,使∠AGE=∠OGB,若存在求出t值,若不存在说明理由.
(1)求点A的坐标;
(2)动点C从O点出发沿x轴负半轴方向匀动,速度为每秒2个单位长度,过点B作BD⊥AC于D,交y轴于点E,设C的运动时间为t,用含t的代数式表示线段AE的长.
(3)在(2)的条件下过点O作OF⊥BD于点F,交AB于点G,连接EG,是否存在t值,使∠AGE=∠OGB,若存在求出t值,若不存在说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/29/2429906649030656/2431566397399040/STEM/84b5e923713e4ca390aec711fc3c5f55.png?resizew=377)
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【推荐1】如图,等腰
的直角边AB=2,点P从A点出发,沿射线AB运动,点Q从C点出发,以相同的速度沿BC的延长线运动,PQ与直线AC交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/fc20755a-add4-48f2-b94f-1f83969b028f.png?resizew=200)
(1)当AP的长为何值时,△PCQ与△ABC的面积相等?
(2)作PE⊥AC于点E,当P、Q运动时,线段DE的长度是否改变?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/fc20755a-add4-48f2-b94f-1f83969b028f.png?resizew=200)
(1)当AP的长为何值时,△PCQ与△ABC的面积相等?
(2)作PE⊥AC于点E,当P、Q运动时,线段DE的长度是否改变?证明你的结论.
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【推荐2】在
中,
,
,
为边
延长线上一动点,点
在边
延长线上,
.点
关于点
的对称点为点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/b0fc08a5-8b15-4c6b-8d65-fbc594b8bc55.png?resizew=212)
(1)设
,
.判断
与
的数量关系,并证明
(2)取
中点
,连接
、
,补全图形,判断
与
的数量关系与位置关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c7d01c3618d579121d95d41a63c565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b48cbaf6de6acacad91add846321e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b680231d068a1f6216295b47a61d0ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/b0fc08a5-8b15-4c6b-8d65-fbc594b8bc55.png?resizew=212)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f706aae1ab18d347033dcdd4c3ddc1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381175bc183cdb9780e17449afe45bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
(2)取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
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【推荐1】如图,
是
的直径,过圆外一点
作
与
相切于
,交
的延长线于
,
于点
,交
于
、
两点,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670761436692480/2675409248108544/STEM/0e6e6d14-e3fb-4071-9e72-f570fd98c7e0.png?resizew=166)
(1)求证:
;
(2)连接
,若
,
,
,求
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64912cf9f1bccc365532ab1cb26481a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670761436692480/2675409248108544/STEM/0e6e6d14-e3fb-4071-9e72-f570fd98c7e0.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b70d4b41ac5da80deb2c153193b9f1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e19bb384de4c166bb901e4eea9af32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59022c3109c4a9cd2b07c9180de6761d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b93a5a960f95c0b2f8bad9f6135a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,
中,
,以
为直径的
交
于点
,点
在
上
,
,
的延长线交于点F.
(1)求证:
与
相切;
(2)若
的半径为3,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03ca3e334c5290ab28b4b4a883c90c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/b0b05d17-3116-4837-8de4-4f01cdba6cf0.png?resizew=218)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613dedf2d90e58591b7ac4a250ac7b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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