1 . 如图,
为锐角三角形,点D在
边上,
,试作点P,使点P在
边上,且
,以下是甲、乙两人的作法:
甲:分别以点A和点C为圆心,以大于
的长为半径画弧,两弧交于点E、F,直线
交
于点P,则点P即为所求.
乙:以点C为圆心,以
长为半径画弧,交
于点P(点P不与点D重合),则点P即为所求.
对于甲、乙两人的作法,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/511e5b73-3d33-4ac9-87ce-a0fb5906728c.png?resizew=167)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2906712896678ab53d2e5df18535ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078c13354d27e9ed4131792a8e43454c.png)
甲:分别以点A和点C为圆心,以大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
乙:以点C为圆心,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
对于甲、乙两人的作法,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/511e5b73-3d33-4ac9-87ce-a0fb5906728c.png?resizew=167)
A.两人皆错误 | B.两人皆正确 | C.甲正确,乙错误 | D.甲错误,乙正确 |
您最近一年使用:0次
2 . 【问题原型】如图,在
中,对角线
的垂直平分线
交
于点F,交
于点E,交
于点O,连接
,
.求证:四边形
是菱形.
【甲同学的证法】证明:
垂直平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
,(第一步)
(第二步)
四边形
是平行四边形(第三步)
又
(第四步)
∴四边形
是菱形(第五步)
【老师评析】甲同学想先利用对角线互相平分证明四边形
是平行四边形,再利用对角线互相垂直证明它是菱形,可惜有一步错了.
【挑错改错】
(1)甲同学的证明过程在第______步出现了错误;
(2)请你根据甲同学的证明思路写出此题正确的证明过程;
(3)直接写出当
中的
______时,四边形
是正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
【甲同学的证法】证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173f7d26d069c0f16a0f6fcb517aa28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7475a34bbc1cd1e1b468056d087828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9e9efc81c91390a1c25647f5bf8750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bdbad69a82cc225f143e384c0f25de5.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
【老师评析】甲同学想先利用对角线互相平分证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
【挑错改错】
(1)甲同学的证明过程在第______步出现了错误;
(2)请你根据甲同学的证明思路写出此题正确的证明过程;
(3)直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/1db47677-5ba6-4400-b7ed-12a6c3d6a79f.jpg?resizew=168)
您最近一年使用:0次
3 . 如图,点
在
内部,点
与点
关于
对称,点
与点
关于
对称.甲、乙两位同学各给出了自己的说法:甲:若
,则
是等边三角形;乙:若
,则
.对于两位同学的说法,下列判定正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6131160eaee962470abc7771df265c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc51601b6c84e2ffade0e91c9feaa970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c84a56823287fa2b878302cff66fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aefee236ce95b71927b9048409c5c68.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/f0e4b685-d0e5-4b79-a272-8a50359cdb32.jpg?resizew=146)
A.甲正确 | B.乙正确 | C.甲、乙都正确 | D.甲、乙都错误 |
您最近一年使用:0次
21-22八年级上·辽宁铁岭·期末
4 . 如图,MN是△ABC中边AB的垂直平分线,垂足为F,AD是∠CAB的平分线,且MN与AD交于点O.连接BO并延长交AC于点E.某同学分析图形后得出下列结论:①AF=BF;②OE=OF;③OA=OB;④∠CAD=∠ABE.上述结论一定正确的是______ (填序号).
![](https://img.xkw.com/dksih/QBM/2021/6/28/2752776937644032/2817964719128576/STEM/26e2dfd6c7b24cb499c18721f217bbe4.png?resizew=197)
您最近一年使用:0次
5 . 如图,四边形
是一张平行四边形纸片,张老师要求学生利用所学知识作出一个菱形.甲、乙两位同学的作法如下:
甲:如图2,分别作
与
的平分线
、
,分别交
于点
,交
于点
,则四边形
是菱形.
乙:如图1,连接
,作
的中垂线交
、
于点
、
,则四边形
是菱形.
则关于甲、乙两人的作法,下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
甲:如图2,分别作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
乙:如图1,连接
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/12/1e08d4d4-e653-4254-9974-e9343c33346a.png?resizew=528)
则关于甲、乙两人的作法,下列判断正确的是( )
A.甲、乙均正确 | B.甲、乙均错误 | C.仅甲正确 | D.仅乙正确 |
您最近一年使用:0次
6 . 如图,在四边形ABCD中,
,
,对角线AC,BD相交于点O,下列结论中:
①
;②AC垂直平分BD;③AC平分
,
;④BD平分
,
;⑤四边形ABCD的面积
.正确的是______ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb34d917a073024625616e4edf22016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431c8bb7b1f97d9cba9e0b4266975204.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/c645c2dd-5256-41c4-8282-c2ed1abdde6b.png?resizew=117)
您最近一年使用:0次
2021-11-17更新
|
133次组卷
|
2卷引用:山东省临沂市临沭县2021-2022学年八年级上学期期中数学试题
7 . 下面是某同学学习完“特殊的平行四边形”后对某一道试题的证明:
试题:如图,在平行四边形
中,对角线
的垂直平分线
交
于点
,交
于点
,交
于点
.求证:四边形
是菱形.
证明:
是
的垂直平分线,
,
,
四边形
是平行四边形.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
,
平行四边形
是菱形.⑤
(1)该同学的证明过程在第___步出现了错误;
(2)按照该同学的证明过程,步骤③的依据是___;步骤⑤的依据是___;
(3)写出此题的正确解答过程.
试题:如图,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/12e25b38-8d75-4b0e-aadd-ca0334227a61.png?resizew=248)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173f7d26d069c0f16a0f6fcb517aa28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab73c79957619fa737a0af0b746b2e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751428215fe07b49c516ab9794eeaf7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218bec0fef9c62935ed473a07deaf695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(1)该同学的证明过程在第___步出现了错误;
(2)按照该同学的证明过程,步骤③的依据是___;步骤⑤的依据是___;
(3)写出此题的正确解答过程.
您最近一年使用:0次
8 . 如图所示,在
中,
,
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/67b0db5d-5f8d-4831-95e9-430add147bba.png?resizew=203)
(1)下列操作中,直线
是______的垂直平分线,作直线
的正确顺序应该是______.(填序号)
①过点
,
作直线.
②分别以
,
为圆心,大于
的同样长为半径作弧,两弧分别交于点
,
.
③则直线
就是线段______的垂直平分线.
(2)若直线
交
于点
,交
于点
,连接
,则
的周长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/67b0db5d-5f8d-4831-95e9-430add147bba.png?resizew=203)
(1)下列操作中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
②分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d452f74791f58e8400cb8d2d6038dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
③则直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
您最近一年使用:0次
9 . 如图,在△ABC中,∠BAC=124°,分别作AC,AB两边的垂直平分线PM,PN,垂足分别是点M,N.以下说法:①∠P=56°;②∠EAF=68°;③PE=PF;④点P到点B和点C的距离相等.正确的是_____ (填序号).
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2021-03-05更新
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5卷引用:安徽省安庆市怀宁县2020-2021学年八年级上学期期末数学试题
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2021九年级·北京·专题练习
10 . 如图,
,
,这个图形叫做“筝形”,数学兴趣小组几名同学探究出关于它的如下结论:①
;②
;③
;④
.其中正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696054392512512/2696689207271424/STEM/c3a436f03c8a4c449b672d623fea41fd.png?resizew=126)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d45c4eca07b62d828ea8c5cf611023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f2a8a3a38ec4119d5e1016dd04f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb15e48f2b9b6a0bb3cb764837125c9e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696054392512512/2696689207271424/STEM/c3a436f03c8a4c449b672d623fea41fd.png?resizew=126)
A.①②③④ | B.①②③ | C.①②④ | D.②③④ |
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