名校
1 . 如图,已知
,射线
交
于点
,交
于点
.
(在
的上方)作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bf01503c35ab5e999fad761572ee85.png)
(2)求证:
.
证明:
(已知),且
,
(________),
,(________)
________![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又
(已知),
(________)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bf01503c35ab5e999fad761572ee85.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7338856efe43dac491864dc1e9bdde90.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4600b023d0da1f2f697aa897043d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea680735565bfa76db27d7c6c970197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5ba4cba99b9b1912068bb501ef00e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d0d07ef7dc7d04b02e25e7fe6c0e3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39681f4995dc582a47459607cc6bbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cc741b6fba7ce725bf7bb6270c8ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bda281982119ab3bdc8abfc05ad2f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b671ec535aca897737896faf797a670.png)
您最近一年使用:0次
2 . 完成下面推理过程.
如图,
交
于点F,
垂足为点M,
,
,求证:
.
,
,
∴
,
∴
( ),
∴
,(两直线平行,同位角相等)
∵
,(已知)
∴
,(等量代换)
∴
,( )
∵
,(已知)
∴ ,(内错角相等,两直线平行)
∴ .( )
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bebf68c92f3fc0de750330b001df56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779269f1a17e5eccd41f9f5d64b29e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6010d78c8fd2fc4f5f2200cbb1adb5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bebf68c92f3fc0de750330b001df56.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e11eaa838a425ca3aa10c9527929846.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2bb918fe721419d3bcd0777cd40e8c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb9d97916daab9ba3a7fbc0dc269883.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7475ed82abed407ad2ff74cf3f59600.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779269f1a17e5eccd41f9f5d64b29e27.png)
∴ ,(内错角相等,两直线平行)
∴ .( )
您最近一年使用:0次
3 . 已知:如图所示,
交于点O,
平分
与
相交于点F,
平分
与
相交于点E,
.补全下列证明过程.
.
证明:∵
,
∴
(________),
∴
(_______).
∵
平分
,
平分
,
∴
________,
________(________),
∴
(________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcabb6fa6da15ec93209d21671b7055a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c01518bd608069d449dfe185f1fccea.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4208adc6ee623bfc2134d8816b5834e.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcabb6fa6da15ec93209d21671b7055a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce4f975916052e325b2d7b6c58f9ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d6e08342b416324299c65553c86904.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c01518bd608069d449dfe185f1fccea.png)
您最近一年使用:0次
4 . 小明在探究“夹在一组平行线间的线段的垂直平分线与平行线相交后所构成的四边形的形状”时做了如下操作,请你完成小明的操作:如图,在四边形
中,
,
是对角线.
的垂直平分线
,
分别交
,
,
于点
,
,
,连接
,
.(只保留作图痕迹)
(2)在(1)问所作的图形中,求证:四边形
为菱形.(请完成下面的填空)
证明:
垂直平分
,
①______,
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f18891e50f85c33319d256f48d224da.png)
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd903f72cc979e0c254c4e96b87a108.png)
,
③______,
,
四边形
为平行四边形,
又
④______,
四边形
为菱形.
请你依照题意完成下面命题:夹在一组平行线间的线段的垂直平分线与平行线相交后⑤______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/1dde8112e8eb968fd042418dd632759e.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)在(1)问所作的图形中,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173f7d26d069c0f16a0f6fcb517aa28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6706c88443ead35c76bcf2f3ec24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f18891e50f85c33319d256f48d224da.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf81da91f4f486850d143c5963abc13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac0b5d17fa816eaccc1bac76e03180e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd903f72cc979e0c254c4e96b87a108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b50e381498a61e24b6e7cb2dc33b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abef313fcb5f27ddaa76ec395dea7a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
请你依照题意完成下面命题:夹在一组平行线间的线段的垂直平分线与平行线相交后⑤______.
您最近一年使用:0次
5 . 如图,
,
.
求证:
.
根据图形和已知条件,请补全下面这道题的解答过程.
证明:∵
( ),
∴
( ).
∴
( ).
又∵
(已知),
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
.
∴
.
∴
(________),
即
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66f3f3d1796ddf5b02469d13f1b4a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d93d1a5af01fe4172a8a35eb5dd0656.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
根据图形和已知条件,请补全下面这道题的解答过程.
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66f3f3d1796ddf5b02469d13f1b4a8b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379052873bad47eb7a23ad1bafe9bee6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f90318c1a8d868d69fba0e8ab960bfc.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d93d1a5af01fe4172a8a35eb5dd0656.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5a6aa03d69d93f9530e9f33b17fbf2b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0707b9665d442d97050bffe68d80bbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af8c5f9d4812b4d38d4abe3b1815fbf.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
您最近一年使用:0次
6 . 学习了平行四边形后,小虹进行了拓展性研究.她发现,如果作平行四边形一条对角线的垂直平分线,那么这个平行四边形的一组对边截垂直平分线所得的线段被垂足平分.她的解决思路是通过证明对应线段所在的两个三角形全等得出结论.请根据她的思路完成以下作图与填空:
用直尺和圆规,作
的垂直平分线交
于点
,交
于点
,垂足为点
.
只保留作图痕迹![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
是平行四边形,
是对角线,
垂直平分
,垂足为点
.
求证:
.
证明:
四边形
是平行四边形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d3a7c38ab21a2ad93426f87b3fb908.png)
①
___②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
垂直平分
,
____③
又
____④
___⑤![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
.
.
小虹再进一步研究发现,过平行四边形对角线
中点的直线与平行四边形一组对边相交形成的线段均有此特征.请你依照题意完成下面命题:
过平行四边形对角线中点的直线被一组对边截得的线段被对角线的中点___⑥
用直尺和圆规,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94190469ba2229faa6fdcc96841803da.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e76526b18b736232d9c273a07904dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d3a7c38ab21a2ad93426f87b3fb908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c771d59d2be940a10a4c6887751043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb6acdcab687e9e1c279f39d3d08f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5231d3a7c62f1c23541330177b786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544c2530493cb34682993aa532397b55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2298d87c5466114fea4cc9ccfdcae.png)
小虹再进一步研究发现,过平行四边形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
过平行四边形对角线中点的直线被一组对边截得的线段被对角线的中点___⑥
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7 . 如图,
、
、
和和
、
、
分别在同一直线上,且
,
.求证:
.
证明:
,
又
(对顶角相等),
______
______(等量代换).
______
____________( )
(______)
又
,
(等量代换)
______
_____(_______)
(______)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/e50ce9ef89a466df68124a1dccff5663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca072d47bbbec34b226b47bd28e48f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d5bb215014f43bed47f6536922c532.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a569e54557b0a496e527b56a821b9f27.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54bb3caba2b157026325b3d8a5404fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f617fa80f09fc245909492f5335ea5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd6c86f68a58840519075a66d45acfa.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5029c57a4af20fdc657662267b636398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a32bbb408cec35840c8085a6764f3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa66d232ac35d27377093b939755b66.png)
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8 . 如图,已知
,
,
,求证:
.把以下证明过程补充完整,并在括号内填写理由或数学式.
(已知)
____
_____(_____________________________)
(_____________________________)
又
(已知)
________(等量代换)
____
_____(_____________________________)
(_____________________________)
(已知)
(垂直定义)
(等量代换)
(垂直定义)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffae22f161495ba3552ee0c1caf53ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ba89e6a08f244d2fa46607bf729551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3122dca7febe1c67d2d1d53724dd7070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8794a1ed9f2fc6bf7ea8bd65940fc90d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5992a0ec9e24cd65e64ebf0f7aa6fdec.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ba89e6a08f244d2fa46607bf729551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724092c7e0f691b29e7e2c0860c8178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a807fd5750c3d5c2327f485e66a28972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090fdbfcc5ff68b6cfee81ee222c14db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1025cf069c844992a2635e99e4d6493c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4fba41c9b773373d7b7670ede81d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc81f71979e87289fc81f75548a6b1a.png)
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9 . (1)问题背景:小刚遇到一个这样问题:如图
,两条相等的线段
,
交于点
,
,连接
,
,求证:
.通过尝试他发现通过平移可以解决这个问题.
证明:过点
作
且使
,连接
,
四边形
为平行四边形,则
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
,
又
,
为等边三角形,
,
,即
.
请完成证明中的三个填空.并参考小刚同学思考的方法,解决下列问题:
(2)类比运用:如图
,
与
相交于点
,
,
,
,
,
,求线段
的长;
(3)联系拓展:如图3,
的三条中线分别为
,
,
.三条中线的交点为
.若
的面积为
,则以
,
,
的长度为三边长的三角形的面积等于 (请直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fb66948f75acdc512312bef81bec07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3cd5634f31753b9a4f2e5462011c84.png)
证明:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f530b7ce530b159df8339f93dc505c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132182fb9f12caccc4204bbef99f37bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634d6f7a95c2c1484be3324e5a53953c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8628d40dd43e71e803542377ea7399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73e37c3b30b0bc64d30734cead82c4b.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a71d8fc13b8b20916408d673d10a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce86c50f571680761b819deb0bbf8a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c3e92db1551b7ca36fdd3e619cb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3af79014744fa37d6804ee186cc87f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3cd5634f31753b9a4f2e5462011c84.png)
请完成证明中的三个填空.并参考小刚同学思考的方法,解决下列问题:
(2)类比运用:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd0c00f62c22e90e7d542a2f8dd83d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49919f576b3d80f7ba01861a71fb373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36a1938df65db2b68bf7595b97bafa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c453a37da0d381f3e0d86dbcc234d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b30aafa9f055536b6eb2eacb4792c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(3)联系拓展:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d11746005a0e806f2d27f89e3d9e9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
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10 . 综合与实践
(1)如图①,正方形
的对角线相交于点O,点O又是正方形
的一个顶点.在实验与探究中,小州发现通过证明
,可得
.请帮助小州完成证明过程.
【类比探究】
(2)如图②,若四边形
是矩形,
为对角线
上任意一点,过
作
,交
于点
,当
时,求证:
.
(3)如图③,若四边形
是平行四边形,
为对角线
上任意一点,点
在
上,且
,求证:
.
(1)如图①,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c29feba6e7ec88196414dcd7d9ba68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b970bca65e9310156cd1ed1aa1202c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
【类比探究】
(2)如图②,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4caec8d188ef1beeb5dda79215098ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd2ba1625f563c997a203e0f5cd2fb2c.png)
(3)如图③,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/4470bcf7a7e2e87c8bd25749d5d5d2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f226e7493044e8a186f0de1b14563be9.png)
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