如图,在平行四边形
中,
,
的平分线交
于点
,
,
,垂足为点
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.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/72f7d9f5e71bfef8188b1216c1276c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c132b1634ce91b5879940593c4c65716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5383ff62f7047721e61397694588a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
23-24八年级下·上海青浦·期中 查看更多[3]
上海市青浦区2023-2024学年八年级下学期期中数学试题(已下线)专题03四边形(考点清单,知识导图+8大考点清单&题型解读)-2023-2024学年八年级数学下学期期末考点大串讲(沪教版)(已下线)专题03四边形(考题猜想,易错、好题精选18个考点60题专练)-2023-2024学年八年级数学下学期期末考点大串讲(沪教版)
更新时间:2024-04-17 15:45:05
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【推荐1】如图,在桌上放置一副三角板(忽略厚度),直角
与
角
顶点重合.三角板
可绕着点A旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/bcc2f4a2-0316-4a08-bf2c-e1a276a7b476.png?resizew=149)
(1)当
平分
时,求
的度数.
(2)在旋转过程中,保持
在
内部,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5ab785f46ce367c0bda8f9036c356c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ef9f6ce55f01eef275448a1a26f963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/bcc2f4a2-0316-4a08-bf2c-e1a276a7b476.png?resizew=149)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(2)在旋转过程中,保持
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8352e81dbe91aec4032bc63a0da5fce.png)
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【推荐2】(1)如图,点O在直线
上,
,若
,
平分
.求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/5754abc6-6249-4d7d-912a-5942c5c62173.png?resizew=166)
(2)如图,点C是线段
上的一点,点M是线段
的中点,点N是线段
的中点.如果
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412077581229ebf492517862e12cff6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c9f506412b2e9fdadb00b092106d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d86a4c0dcb4ec85db47c65b9e7a4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9152d43d3e83b1a6ee18f02f3ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/5754abc6-6249-4d7d-912a-5942c5c62173.png?resizew=166)
(2)如图,点C是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1590bcd357f96af7dfbc8b59687979d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/137d1137-9985-4c2b-a314-bb615e0557fc.png?resizew=430)
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【推荐1】如图,在
中,
,
是
的角平分线.
时,求
的度数;
(2)当
时,求证:
.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13430a749d8c4e3ba11b063a20fe0dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2677ee9264fd2b6338e4ed853c91e320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393633c6816527305bbcd715d08b5d3f.png)
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【推荐2】如图,在
中,直径为
,正方形
的四个顶点分别在半径
以及
上,并且
,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/0c4c357c-be9f-4796-a9d3-a5328fd9027a.png?resizew=148)
(1)求
的长;
(2)求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83015effa1eaf4545342c1efc78d5432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7d43faccc406e32028c3f3a0404a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/0c4c357c-be9f-4796-a9d3-a5328fd9027a.png?resizew=148)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,在四边形
中,
,
,对角线
,
相交于点
,AC平分
,过点
作
交
的延长线于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749340588048384/2752049785716736/STEM/937c5edd-1130-4fa7-a0cf-e2af16352cf9.png)
(1)求证:四边形
是菱形:
(2)若
,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/227b99661c519f7a9e682ecade550f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749340588048384/2752049785716736/STEM/937c5edd-1130-4fa7-a0cf-e2af16352cf9.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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【推荐2】如图,在▱ABCD中,点O是对角线AC、BD的交点,AD⊥BD,且AB=10,AD=6,求AC的长.(结果保留根号)
![](https://img.xkw.com/dksih/QBM/2019/8/24/2275873853145088/2276574597111808/STEM/b1717a4c45674d779a1ae69e1c63e571.png?resizew=189)
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【推荐1】如图,
中,点E是
边的中点,延长
交
的延长线于点F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680b53673467d5e29454148104e32fec.png)
![](https://img.xkw.com/dksih/QBM/2023/7/21/3285580811460608/3288653801259008/STEM/d8870b8573f940fdbf22a1bd698536e2.png?resizew=182)
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【推荐2】如图,
中,
平分
交
于点
,
平分
交
于点
.请你判断
与
的数量关系并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967796683628544/2973064001568768/STEM/de86fe461f414a44aa87cd34e9ef2059.png?resizew=218)
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