(对称型)如图,
中,
,点
是
的中点.求证:
(1)
.
(2)
.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/ad90c6a6-3de2-4b91-829c-0ac9a73c5a8c.png?resizew=145)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901d94b32038d99ef9e748f1fe2b8c55.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ba77f66ecad8eb4a7a63f169f28a3b7.png)
23-24八年级上·全国·课后作业 查看更多[2]
更新时间:2023-09-15 08:29:03
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解答题-问答题
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【推荐1】已知,点B、E、C、F在同一直线上,
,
,
.
(1)证:
;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaae99b4ac308549134169e69247a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/0dfc4e39-4c0b-46fc-9a44-320e94ce3064.png?resizew=180)
(1)证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac61f3477e623aa4f924a82bd7a06ce4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbc97ba3138ddbc9e76724cac9cd63d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114a43fd02a222d89e868b0d1595d480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐2】【材料】勾股定理的证明:两个全等的直角三角形按如图1所示的方式摆放,连接
,
的三边长分别为a,b,
,利用四边形
的面积的不同求法,列等量关系,可证得勾股定理.
______(用含a,b的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65b678847a4c2d27fd9d2b4c3c9dd61.png)
=______(用含a,b,c的式子表示)
利用面积的等量关系,整理得出:______;
【探究】淇淇将
从图1的位置开始沿
向左移动,直到点F与点B重合时停止,如图2所示,
与
交于点O.淇淇在图2中也尝试利用四边形
的面积对勾股定理进行证明.
(2)请你帮助她完成证明过程;
(3)【应用】在图2的基础上,若四边形
的面积为200,
的长为12,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b50604ad150577b206c72a70b161f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61510c34c5795d7261569b4d09098271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e993cff7d84b71a81e2851b212d714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65b678847a4c2d27fd9d2b4c3c9dd61.png)
=______(用含a,b,c的式子表示)
利用面积的等量关系,整理得出:______;
【探究】淇淇将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/61510c34c5795d7261569b4d09098271.png)
(2)请你帮助她完成证明过程;
(3)【应用】在图2的基础上,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】在四边形ABCD中,AD=BC,AB=CD.求证:△ABC≌△CDA.
![](https://img.xkw.com/dksih/QBM/2019/9/14/2290486756335616/2290696269062144/STEM/4d144f78c3b34449b29a0a3eb77330d9.png?resizew=150)
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名校
【推荐2】综合与探究
【操作探索】
在生活中,我们常用实物体验图形变换的过程.小颖同学利用一块风筝纸片完成了如下的操作:
如图1,已知四边形
,
,
.
(1)操作一:沿
所在的直线对折,如图1.你认为左右两侧对折后能完全重合吗?并说明理由;
(2)操作二:对折后,将风筝纸片剪成两个三角形(
和
),摆成如图2所示的图形,
与
相交于点
,
与
相交于点
.试说明
.
【应用拓展】
(3)如图3,在
中,
,
,点
在边
上,
,点
,
在线段
上,
,
,若
的面积为24,求
与
的面积之和.
【操作探索】
在生活中,我们常用实物体验图形变换的过程.小颖同学利用一块风筝纸片完成了如下的操作:
如图1,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
(1)操作一:沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)操作二:对折后,将风筝纸片剪成两个三角形(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6829c6214e60edbfbf1e31601c6bcb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.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/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
【应用拓展】
(3)如图3,在
![](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/f2da1d50433aecf541991fd0f01773cb.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/8a7e75d7342e6f087370d09181b17a4e.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcff853a0873d0a6b93e4f90725752a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456e0f77d83975fdbdb60b499cb5b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
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