1 . 在
中,
,
,在平面内,把
绕点
旋转得到
,
垂直直线
,垂足为
,
的延长线交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/74502bfb-9f85-4c96-90c9-902d94ccb510.png?resizew=333)
(1)如图①,若
,求证:
是等腰三角形;
(2)如图②,若点
在
上,求证:点
是
的中点;
(3)连接
,写出
的最大值和最小值,并在图上画出对应的图形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/74502bfb-9f85-4c96-90c9-902d94ccb510.png?resizew=333)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d480e8b2c516612b47a19cb62d9bb0.png)
(2)如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/06e322e0c87479bba874db9ae9ba36b5.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2 . 综合与实践:动手操作:某校八(1)班数学课外兴趣小组在学完第13章的特殊三角形后,利用手头上的一副三角板,他们将一块直角三角板
(
,
)的直角顶点
放置在另一块直角三角板
(
,
)斜边
的中点处,并将三角板
绕点
任意旋转.
发现结论:
(1)如图,三角板
的两边
分别与另一块三角板的边
交于点
(规定:此时点
均在边
上运动),他们在旋转过程中,发现线段
与
的长总相等及四边形
的面积不会发生变化.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/7988597c-950c-41bb-b7ee-4b1e8f9306ca.png?resizew=188)
问题解决:
①请你帮他们说明
的理由;
②若
,请你帮他们求出四边形
的面积.
拓展延申:
(2)如图,连接
,当
,
时,那么直角三角板
在绕点
旋转一周的过程中,请你直接写出线段
长的最小值和最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6791aee96ff1579101462985839ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5b3967aa677f18e92912d2397f4907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
发现结论:
(1)如图,三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda573d13d7cc0fb63ec05d41faef03b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817610b69f5f7d96bdfc834d1dd699cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817610b69f5f7d96bdfc834d1dd699cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/7988597c-950c-41bb-b7ee-4b1e8f9306ca.png?resizew=188)
问题解决:
①请你帮他们说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51dfab0c1ec275ff83d08c7293968c4.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
拓展延申:
(2)如图,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba027570795fdca25194fde38be3d29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/0ad255f4-3422-4455-b488-2bc88dc2c162.png?resizew=188)
您最近一年使用:0次
2022-11-14更新
|
96次组卷
|
2卷引用: 福建省龙岩市上杭县城区初中2022-2023学年八年级上学期期中检测数学试题
3 . 如图,相互平行的三条直线
,
,
,
与
,
与
之间的距离分别为1,3,若在三条直线上各取一点,构造一个等腰直角三角形,那么作出的等腰直角三角形面积最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/3ddde589-b21f-4c18-99b1-8916305b18b8.png?resizew=148)
您最近一年使用:0次
4 . 如图,在
中,
.
,点
始终在
的上方,且
,点
为射线
上任意一点(点
与点
不重合),连接
,将线段
绕点
顺时针旋转
得到线段
,直线
交直线
于点
.
(1)如图
,当
时,求证
;
(2)当点
为
边的中点时,连接
,求
的最大值;
(3)如图
,若
,
时,求
的面积.
![](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/408c273b6a9243f64b71f515ef87feb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de295e7601c7e7820316bb183f0fcc51.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/36300e52-6fe6-4206-b802-de5532d05729.jpg?resizew=327)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6406b4f25d9175b1a1bd9c739cb740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5c475c18c418395b181d5acbec0700.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90323c094c06f4628ac05f0af3e8a3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
您最近一年使用:0次
2023-11-15更新
|
111次组卷
|
2卷引用:福建省福州福清市2023-2024学年九年级上学期期中数学试题
名校
5 . 如图,矩形
中,点
为
边的中点,一个含
角的三角板的直角顶点与点
重合,两直角边可正好经过矩形的顶点
和
(如图①).
(1)求证:
.
(2)如图②,将三角板绕点
按顺时针方向旋转,使其两直角边分别与矩形的
边和
边交于点
(当点
与点
重合时停止旋转),若
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/ec4b0d8b-530d-45e8-a05f-26625bfa67a3.jpg?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
(2)如图②,将三角板绕点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83fd42df335c85bf92b7961b9851977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f8b3d45ae1743416253d835c054456.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/4d3f209d-346a-4a2f-a74b-3d23af32dcc5.jpg?resizew=181)
您最近一年使用:0次
名校
6 . 如图,已知正方形
的边长为1,点
是线段
上的动点,过点
作
,使
,连接
交
于点
,
交
于点
.以下结论正确的是_______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/dd698c73-6b01-412c-b6e9-822d99b95b65.png?resizew=294)
①
; ②
;
③点
到直线
的距离最大值为
; ④点
到直线
的距离最大值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cbd1d4bdcf1199ec44f9ba5348ac42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/dd698c73-6b01-412c-b6e9-822d99b95b65.png?resizew=294)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab16176d95f6289c0f301d95ef115138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c193747211812695275d04175560a39.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
您最近一年使用:0次
7 . 如图,已知
中,
,D是
的中点,
于点E;连接
,则下列结论正确的是___________ .(写出所有正确结论的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/b60c9775-1380-48a8-93dc-93a33ba7d65c.png?resizew=174)
①
; ②当E为
中点时,
﹔
③若
,则
; ④若
,则
面积的最大值为2.
![](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/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/b60c9775-1380-48a8-93dc-93a33ba7d65c.png?resizew=174)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b9ef25bfa729a423cde861fa12748d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e20c1b7f55cd8e68a7c3aa58bc944c5.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844659a605e726781cb3cf3ee3f31156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79de67bad8473d74405f9200f0f7d7a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
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2022-08-05更新
|
473次组卷
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6卷引用:福建省福州市福清市2021-2022学年八年级下学期期中数学试题
福建省福州市福清市2021-2022学年八年级下学期期中数学试题(已下线)第3章 勾股定理综合测试卷 -【帮课堂】2022-2023学年八年级数学上册同步精品讲义(苏科版)(已下线)第3章 勾股定理 单元综合检测(难点)-2022-2023学年八年级数学上册同步精品课堂(苏科版)(已下线)2022年江苏省南通启东市九年级中考二模数学试题变式题16-20(已下线)24.2+与圆有关的位置关系(题型精讲精练)3(原卷版)(已下线)24.2+与圆有关的位置关系(题型精讲精练)1(原卷版)
名校
8 . 新定义:若四边形的一组对角均为直角,则称该四边形为对直四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/a38c6677-1e16-4415-843f-6fd4402e4e8f.png?resizew=146)
(1)下列四边形为对直四边形的是______(写出所有正确的序号);
①平行四边形;②矩形;③菱形;④正方形.
(2)如图,在对直四边形ABCD中,已知
,O为AC的中点.
①求证:BD的垂直平分线经过点O;
②若AB=6,BC=8,请在备用图中补全四边形ABCD,使四边形ABCD的面积取得最大值,并求此时BD的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/64e9135f-978a-427b-b708-867670d26e9c.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/a38c6677-1e16-4415-843f-6fd4402e4e8f.png?resizew=146)
(1)下列四边形为对直四边形的是______(写出所有正确的序号);
①平行四边形;②矩形;③菱形;④正方形.
(2)如图,在对直四边形ABCD中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
①求证:BD的垂直平分线经过点O;
②若AB=6,BC=8,请在备用图中补全四边形ABCD,使四边形ABCD的面积取得最大值,并求此时BD的长度.
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2022-07-12更新
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349次组卷
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5卷引用:福建省厦门市莲花中学2023-2024学年九年级上学期月考数学试题
福建省厦门市莲花中学2023-2024学年九年级上学期月考数学试题江苏省徐州市2021-2022学年八年级下学期期末数学试题江苏省徐州市铜山区2021-2022学年八年级下学期期末数学试题江苏省无锡市宜兴市实验中学2022-2023学年八年级下学期3月月考数学试题(已下线)第9章 中心对称图形-平行四边形 全章高频考点专练(4种专练+10个题型+3种思想)原卷版
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解题方法
9 . 已知:在矩形ABCD中,
,
.
(1)如图1,E、F、G、H分别是AD,AB,BC,CD的中点、求证:四边形EFGH是菱形;
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806725323767808/2810011891597312/STEM/e8837131b8b0455e92ee0ec7a989a12d.png?resizew=269)
(2)如图2,若菱形EFGH的三个顶点E、F、H分别在AD,AB,CD上,
.
①连接BG,若
,求AF的长;
②设
,△GFB的面积为S,且S满足函数关系式
.在自变量m的取值范围内,是否存在m,使菱形EPGH面积最大?若存在,请直接写出菱形EFGH面积最大值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
(1)如图1,E、F、G、H分别是AD,AB,BC,CD的中点、求证:四边形EFGH是菱形;
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806725323767808/2810011891597312/STEM/e8837131b8b0455e92ee0ec7a989a12d.png?resizew=269)
(2)如图2,若菱形EFGH的三个顶点E、F、H分别在AD,AB,CD上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a8c65f1604c16a9fe4f0d55ba22dff.png)
①连接BG,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd5da55347194f3d6bbe7f868fea299.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d40fa059a2b28c1ef4b36411999931a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0624aeea4c3f2667a13255a9b12d8e.png)
您最近一年使用:0次
2021-09-17更新
|
534次组卷
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5卷引用:福建省福州华伦中学2020-2021学年八年级下学期期中考试数学试卷
福建省福州华伦中学2020-2021学年八年级下学期期中考试数学试卷(已下线)第07课 特殊平行四边形 解答题(难点2-存在性问题)-2022-2023学年九年级数学上册课后培优分级练(北师大版)(已下线)专题9.40 平行四边形几何模型(中点四边形)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)(已下线)专题18.40 平行四边形几何模型(中点四边形)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题5.15 平行四边形几何模型(中点四边形)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)
10 . 在
中,
,D为
内一点,连接
,CD.
(1)如图1,若
,求
的度数;
(2)如图2,若
,求证:
;
(3)如图3,在(1)的条件下,延长
交
于点E,P为
上一动点,连接
,若
,
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149d217efaf5090696904003ec06393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a929fca455b19682d2a26ecc302123d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/d13ed874-c20c-4c16-8c57-8c2405eed134.png?resizew=512)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08874bada303ee30288a5a2a55b1a402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652cc905c8cc9f213066a52f89830cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42b730d87bb95763a48c69f1b0329ad.png)
(3)如图3,在(1)的条件下,延长
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04be58ea6ca37a850422631eb3e994d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653cbccbcaed70fbc4f65bcbcf78381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785824ccff84bdf76adff99d69cb3e49.png)
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