如图,在
中,
,
是
边上的高.
是
的中点,求证:
;
(2)若
,
,求
的长.
![](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/9d78abbad68bbbf12af10cd40ef4c353.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50196d293a863fe2f9e46199052ab8c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
23-24八年级上·浙江杭州·期末 查看更多[3]
浙江省杭州市拱墅区2023-2024学年八年级上学期期末数学试题(已下线)【2024年】【初二】【期末】【拱墅区】【数学】【徐娴静收集】(已下线)专题02 勾股定理与勾股定理逆定理之九大题型-备战2023-2024学年八年级数学下学期期末真题分类汇编(人教版)
更新时间:2024-03-01 17:40:31
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【推荐1】如图,
是
的弦,点C、D在直线
上,且
,连接
.求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63bd5df12ebe449ea9d978c9d855a96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/c26c9414-94bd-40e6-ad2f-1a869b1d2489.png?resizew=191)
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解答题-作图题
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【推荐2】已知三角形纸片
(如图),将纸片折叠,使点A与点
重合,折痕分别与边
、
交于点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/ed66fdbd-46de-47fb-846d-d7bb31276a20.png?resizew=183)
(1)尺规作图:请画出直线
;(保留作图痕迹,不写作法)
(2)连接
并延长至点
,使得
,如果
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/ed66fdbd-46de-47fb-846d-d7bb31276a20.png?resizew=183)
(1)尺规作图:请画出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0428fcbb93632fa00e2f8930e210ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffbfa5147ca9db848b4b711b6dd962ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
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【推荐1】【课本再现】
本学期同学们在学习第十三章《轴对称》,第三单元
等腰三角形,第二课
等边三角形时
,学习了一个定理.
定理:在直角三角形中,如果一个锐角等于
,那么它所对的直角边等于斜边的一半.
【定理探索】
书中对上面的定理没有给出证明,请你结合图形写出已知、求证并给出定理的证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/58499fbb-1f87-4861-a3a9-889b12668e8b.png?resizew=111)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/2c877751-bda7-4d48-ae8e-f5aae68cdca4.png?resizew=417)
【定理应用】
(1)如图(1),在
中,
,
,
交
于点
,
,则
的长为( )
A.8 B.4 C.12 D.6
(2)如图(2),在
中,
,
,
.点
是斜边
上一点,把
沿
折叠,得到
.
①若
,则
=________
;
②当折痕
时,求点
的位置(即求
的长).
本学期同学们在学习第十三章《轴对称》,第三单元
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a3b530da20da95d70a145ab466981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb22655e73f55e7f7369068ca99f42af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efc380b522e171a5e8f24d52500e728.png)
定理:在直角三角形中,如果一个锐角等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
【定理探索】
书中对上面的定理没有给出证明,请你结合图形写出已知、求证并给出定理的证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/58499fbb-1f87-4861-a3a9-889b12668e8b.png?resizew=111)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/2c877751-bda7-4d48-ae8e-f5aae68cdca4.png?resizew=417)
【定理应用】
(1)如图(1),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3ee061bc43b327214ea7981a25137c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51fc7d1b20a1ce1761714c1733f0511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac943d8c2eb91c0082ada87857d1ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
A.8 B.4 C.12 D.6
(2)如图(2),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da6815bc213dfd78c2f77cd7ded8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac598ec02c8cfb826a8652a857d4388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a5b342a70f7d52c3a2f8d891745e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a783e5ffcf7a4ea9e531ea76199487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01f6f70b5cb3fd3b580e9f298588d6e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9de907642a57ebd47d29e867dfb8d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24b2e257b1f294602d58ca05b916265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②当折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63ab71efa010821650ffe08bd907f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
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【推荐2】如图,在等边△ABC中,∠ABC和∠ACB的平分线相交于点O,BO、OC的垂直平分线分别交BC于E、F两点,求证:△OEF是等边三角形.
![](https://img.xkw.com/dksih/QBM/2020/2/6/2392968732418048/2393307699429376/STEM/0cfecbfbd20d473699580dabf26dbd8d.png?resizew=154)
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【推荐1】如图所示,以长为2的定线段
为边作正方形
,取
的中点P,连接
,在
的延长线上取点F,使
,以AF为边作正方形
,点M在
上.
的长;
(2)点M是
的黄金分割点吗?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6637d04871c75177d867cf1ad5deadb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a6f856872cd504d322ae27919ef2db.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a9eca02ecb768ffa9c517a606758f1.png)
(2)点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图,在四边形ABCD中,AD∥BC,AB=10,BC=6,AC=AD=8.
(1)求∠ACB的度数;
(2)求CD的长.
(1)求∠ACB的度数;
(2)求CD的长.
![](https://img.xkw.com/dksih/QBM/2017/7/15/1730404594089984/1731378663817216/STEM/ba9f1fff-7e48-4039-8754-3d7bf39ed813.png?resizew=188)
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