如果三角形有一边上的中线恰好等于这边的长,那么我们称这个三角形为“美丽三角形”,
(1)如图△ABC中,AB=AC=
,BC=2,求证:△ABC是“美丽三角形”;
(2)在Rt△ABC中,∠C=90°,AC=2
,若△ABC是“美丽三角形”,求BC的长.
(1)如图△ABC中,AB=AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30efdb9c7eb4b788352056f3edf21635.png)
(2)在Rt△ABC中,∠C=90°,AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/11/dc5be185-2341-424c-bf29-7c1ff886a907.png?resizew=109)
18-19八年级上·浙江宁波·期中 查看更多[12]
【校级联考】浙江省宁波市奉化区2018-2019学年八年级上学期期中四校联考数学试题【区级联考】广东省深圳市实验学校坂田校区2018-2019学年八年级上期期末测试数学试题辽宁省鞍山市台安县2018-2019学年八年级下学期6月月考数学试题浙江省绍兴市柯桥区杨汛桥镇中学2019-2020学年八年级上学期期中数学试题江苏省宿迁市钟吾初级中学、钟吾国际学校2019-2020学年八年级上学期期末联考数学试题福建省长汀县第四中学2019-2020学年八年级下学期教学质量检测(一)数学试题浙江省宁波市余姚市舜水中学2021-2022学年八年级上学期期中数学试题浙江省杭州市拱墅区杭州上海世界外国语中学2020-2021学年八年级上学期期中数学试题浙江省宁波市镇海区古塘中学2022-2023学年八年级上学期期中检测数学试题 浙江省宁波市镇海区尚志中学2022-2023学年八年级上学期期中数学试题广东省广州市广州中学2023-2024学年八年级下学期期中数学试题福建省龙岩市高级中学2023-2024学年八年级下学期期中数学试题
更新时间:2018-12-12 09:58:47
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解答题-问答题
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适中
(0.65)
【推荐2】如图,已知
的半径为
,在
中,
、
都是圆的半径,且
.点
在线段
的延长钱上,且
.
![](https://img.xkw.com/dksih/QBM/2021/1/14/2636168060944384/2637453649002496/STEM/c1d29a5e-9745-4c03-b30c-8dd31195fbd0.png?resizew=223)
(1)求线段
的长;
(2)求
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46131668d055a34aebf3e28ea11e90d3.png)
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(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,
为
的直径,
与
相切于点
,
,垂足为点
,
与
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(1)求证:
;
(2)若
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![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7d2a2da5144f0bf6ce091c56b3d5a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb388a36bd5caaa51b7e3c898e3c906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/e761bf89-271c-4938-9cbb-952d0cb8442a.png?resizew=155)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图1.已知Rt△ABC中,∠ACB=90°,D、E分别是AC、BC的中点,连接DE,tan∠BAC=
.
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943186345238528/2963929735307264/STEM/8c68a0a0-805e-42cb-98f4-b4431e2c2197.png?resizew=533)
【问题背景】如图2,将△CDE绕C点旋转一定的角度,连接BE、AD,求证:△ADC∽△BEC;
【尝试运用】如图3,当△CDE绕C点旋转过程中,AD、BE交于点H,连接CH,CH=5,求AH﹣
BH的值;
【拓展延伸】如图3,若CD=1,当△CDE绕C点旋转过程中,直接写出△ABH面积的最大值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943186345238528/2963929735307264/STEM/8c68a0a0-805e-42cb-98f4-b4431e2c2197.png?resizew=533)
【问题背景】如图2,将△CDE绕C点旋转一定的角度,连接BE、AD,求证:△ADC∽△BEC;
【尝试运用】如图3,当△CDE绕C点旋转过程中,AD、BE交于点H,连接CH,CH=5,求AH﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
【拓展延伸】如图3,若CD=1,当△CDE绕C点旋转过程中,直接写出△ABH面积的最大值是
您最近一年使用:0次