在正方形
中,点G是边
上的一个动点,点F、E在边
上,
,且
、
的延长线相交于点P.
的度数=______;
(2)如图2,当点E与C不重合时,在点G的运动过程中,
的度数是否发生变化,若不变,求出
的度数,若变化,请说明理由
(3)在(2)的条件下,如图3,过D作
于点N,连接
,取
的中点M,连接
,在点G的运动过程中,求
的值(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efcfc97319d4d6ae2f362586cc9108e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be109148d3340814f0149bbddd85586a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867fd1b4276400ea785ec29e337a2b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(2)如图2,当点E与C不重合时,在点G的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(3)在(2)的条件下,如图3,过D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d28afeda2e33b875e9e4c27760c4a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd038bd12b5e571fdce882ee9400373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ba34242cd639f1446a2999ecf78ba8.png)
更新时间:2024-02-29 16:39:23
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,在
中,
,
,
,点D为
外一点,且在
右侧,
上方,
,连接
,作
,交
于点F,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/d1648a95-38bb-438a-b4fc-b27985d67eb7.png?resizew=325)
(1)图1中与
相等的角是________;
(2)如图2,延长
与射线
相交于点E,
①求
的度数;
②过点F作
的平行线,交
于点G,求
的长.
![](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/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/d1648a95-38bb-438a-b4fc-b27985d67eb7.png?resizew=325)
(1)图1中与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
②过点F作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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【推荐2】如图,在
中,
,
,以AB为直径作
,连接
,过点B作
交
于点D,连接AD交OC于点E.
(1)求证:
;
(2)若
的半径为4,求OE的长.
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1df7caed01a23c69b891fb7852f335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/cee16e14-f20d-4e77-ae4e-fff7b74013c8.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eac6f98ed81727dc5f6699ea5117fff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】已知,在平面直角坐标系中,点A在x轴上,点B在y轴正半轴上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/c1a9b436-4bd9-4076-b7cf-2ff205bb9cca.png?resizew=539)
(1)当点A的坐标为(﹣2,0)时,连接AB,以AB为直角边,点B为直角顶点作等腰直角三角形ABC.
①若点B的坐标为(0,4),且点C在第二象限,求点C的坐标;
②若OB>OA,过点C作CD⊥x轴于点D,则|OB﹣CD|的值是否为一个定值?若是,请求出这个值,若不是,请说明理由;
(2)当点A在x轴的正半轴上,且OB=OA时,在第四象限内有一点E,连接OE,AE,有∠AEO=135°.连接BE,求∠AEB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/c1a9b436-4bd9-4076-b7cf-2ff205bb9cca.png?resizew=539)
(1)当点A的坐标为(﹣2,0)时,连接AB,以AB为直角边,点B为直角顶点作等腰直角三角形ABC.
①若点B的坐标为(0,4),且点C在第二象限,求点C的坐标;
②若OB>OA,过点C作CD⊥x轴于点D,则|OB﹣CD|的值是否为一个定值?若是,请求出这个值,若不是,请说明理由;
(2)当点A在x轴的正半轴上,且OB=OA时,在第四象限内有一点E,连接OE,AE,有∠AEO=135°.连接BE,求∠AEB的度数.
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解题方法
【推荐2】在平面直角坐标系,点A(a,0),点B(0,b),已知a,b满足a2+b2+8a+8b+32=0.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14c0af61-f935-4fd9-9b9b-c716614821f4.png?resizew=190)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/adcf9119-fb2a-4e61-b096-4dae319f2e6c.png?resizew=192)
(1)求点A、B的坐标;
(2)如图1,点E为线段OB上一点,连接AE,过点A作AF⊥AE,且AF=AE,连接BF交x轴于点D,若点F的坐标为(-2,c),求c的值及OE的长;
(3)在(2)的条件下,如图2,过点E作EG⊥AB于点G,过点B作BC//x轴交EG的延长线于点C,连接OC、AC,试判断△AOC的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14c0af61-f935-4fd9-9b9b-c716614821f4.png?resizew=190)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/adcf9119-fb2a-4e61-b096-4dae319f2e6c.png?resizew=192)
(1)求点A、B的坐标;
(2)如图1,点E为线段OB上一点,连接AE,过点A作AF⊥AE,且AF=AE,连接BF交x轴于点D,若点F的坐标为(-2,c),求c的值及OE的长;
(3)在(2)的条件下,如图2,过点E作EG⊥AB于点G,过点B作BC//x轴交EG的延长线于点C,连接OC、AC,试判断△AOC的形状,并说明理由.
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【推荐3】从三角形一个顶点引出一条射线于对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中一个为等腰三角形,另一个与原三角形相似,我们把这条线段叫做这个三角形的优美线.
(1)如图,在△ABC中,AD为角平分线,∠B=50°,∠C=30°,求证:AD为△ABC的优美线;
(2)在△ABC中,∠B=46°,AD是△ABC的优美线,且△ABD是以AB为腰的等腰三角形,求∠BAC的度数;
(3)在△ABC中,AB=4,AC=2,AD是△ABC的优美线,且△ABD是等腰三角形,直接写出优美线AD的长.
(1)如图,在△ABC中,AD为角平分线,∠B=50°,∠C=30°,求证:AD为△ABC的优美线;
(2)在△ABC中,∠B=46°,AD是△ABC的优美线,且△ABD是以AB为腰的等腰三角形,求∠BAC的度数;
(3)在△ABC中,AB=4,AC=2,AD是△ABC的优美线,且△ABD是等腰三角形,直接写出优美线AD的长.
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809308363956224/1811230429069312/STEM/0396bca699f846d49a34c8a87dc75221.png?resizew=149)
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【推荐1】如图,在正方形
中,点M在
边上,点N在正方形
外部,且满足
,
.连接
,
,取
的中点E,连接
,
,交于F点.
的度数;
(2)请探究线段
,
,
所满足的等量关系,并证明你的结论;
(3)设
,若点M沿着线段
从点C运动到点D,则在该运动过程中,线段
所扫过的面积为________(直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c447ca190f5168a07befbbfa8471ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25be6617d61a7cb5a88b0d680b252b10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
(2)请探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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【推荐2】如图1,在边长为4的正方形
中,点H为
上一动点,且
,截取
,且
交线段
于M,过M作
的垂线
交
于N.
;
(2)如图2,若点M是
的中点,求
的周长;
(3)在动点H逐渐向点A运动(HB逐渐增大)的过程中,
的周长如何变化?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff9613c5a28df46f8c7a142069806b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82e0e08236295f112b5f3b891bb413d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0114410515a8d139216928adb22b63e.png)
(2)如图2,若点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
(3)在动点H逐渐向点A运动(HB逐渐增大)的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
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解题方法
【推荐1】如图,以
的两边
、
分别向外作等边
和等边
,
与
交于点
,已知
,
,
.
(1)求证:
;
(2)求
的度数及
的长;
(3)若点
、
分别是等边
和等边
的重心(三边中线的交点),连接
、
、
,作出图象,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd27b1d10a0745712f4d4198a9906acf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add18fdf2049abff08a687b950f1cc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6da2235c42867f9a79007c3fc83fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2645917397155840/2669434506764288/STEM/76cf81491e5442d48c1214b523dfda65.png?resizew=232)
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真题
名校
【推荐2】如图,在
中,
,点D是
边的中点,点O在
边上,⊙
经过点C且与
边相切于点E,
.
是⊙
的切线;
(2)若
,
,求⊙
的半径及
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ccc7ab5b4efe8a3d651f0797daf5b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905f306dc08525842a96cfcab32c1ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
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