如图,在
中,
,
平分
,交
于点D.若
,则
等于多少度?
![](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/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833512770625536/2841909401788416/STEM/4dcbf01d3055407a9ac4b1f3583af027.png?resizew=116)
20-21八年级下·全国·课后作业 查看更多[1]
(已下线)【北师大版课时练习】 八年级下册 第一章 三角形的证明 1 等腰三角形
更新时间:2021-11-01 14:22:23
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在等腰三角形
中,
,
,点
为直线
上一点,
于点
,直线
与直线
交于点
,
为直线
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/d0cfd2be-c729-429e-8d2c-3a7987acb868.png?resizew=239)
(1)若
为线段
上一点,如图1,如果
,
,
,求
的长;
(2)若
为线段
上一点,如图1,求证:
;
(3)若
为
延长线上一点,如图2,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685bc9f51445c6ecd5158f4419969f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/53e5b0a448b6ffa435486e09df0f23cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/d0cfd2be-c729-429e-8d2c-3a7987acb868.png?resizew=239)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14252009a6dd4ced2746d25089bafb2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5564681937f41e1489d69b20a71f9222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad77ee5dab4fbed93c0172b2330077cf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32ac820e9ab572690649f16b87aa273.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知线段AB,用尺规作∠ABC=90°,作法如下:
(1)请证明∠ABC=90°;
(2)请你用不同的方法,用尺规作∠ABC=90°.
(要求:保留作图痕迹,不写作法,并用2B铅笔把作图痕迹描粗)
小明的作法:(1)分别以A、B为圆心AB长为半径画弧,两弧交于点P;(2)以P为圆心,AB长为半径画弧交AP的延长线于C;连接AC,则∠ABC=90° | ![]() |
(2)请你用不同的方法,用尺规作∠ABC=90°.
(要求:保留作图痕迹,不写作法,并用2B铅笔把作图痕迹描粗)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,将
沿
方向向右平移得到
.
的度数;
(2)若
,
.请求出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cb0603b59b4e71ff63f015bbddc973a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa029df4c509fd822a0aa7b4d1eeb523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0436efefa53aad714565ab2ba7ff90fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5052a5421cfc0bd6f46a1ac53f42d8fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0c0cfa60a6f566ccab67b9132c6946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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解答题-问答题
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适中
(0.65)
【推荐2】定义:顶角相等且顶点重合的两个等腰三角形叫做“同源三角形”,我们称这两个顶角为“同源角”.如图,
和
为“同源三角形”,
,
,
与
为“同源角”.
和
为“同源三角形”,试判断
与
的数量关系,并说明理由.
(2)如图2,若“同源三角形”
和
上的点
,
,
在同一条直线上,且
,则
______°.
(3)如图3,
和
为“同源三角形”,且“同源角”的度数为
时,分别取
,
的中点
,
,连接
,
,
,试说明
是等腰直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,若“同源三角形”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4557ee10ad429943f40252d9bb90565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedf3c64d742a5be6087b7ee916581d0.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
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解答题-问答题
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适中
(0.65)
【推荐1】已知点C是线段AB上一点,在线段AB的同侧作△CAD和△CBE,直线BD和AE相交于点F,CA=CD,CB=CE,∠ACD=∠BCE。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/d53b1493-6d1d-435c-875f-8e3f70da11cf.png?resizew=203)
(1)如图①,若∠ACD=600,则∠AFB=___________;若∠ACD=
,则∠AFB=___________。
(2)如图②,将图①中的△CAD绕点C顺时针旋转任意角度(交点F至少在BD、AE中的一条线段上),试探究∠AFB与
的数量关系,并说明理由。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/d53b1493-6d1d-435c-875f-8e3f70da11cf.png?resizew=203)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/d0fbe462-986f-44a2-91a6-7c63a2921fc1.png?resizew=202)
(1)如图①,若∠ACD=600,则∠AFB=___________;若∠ACD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)如图②,将图①中的△CAD绕点C顺时针旋转任意角度(交点F至少在BD、AE中的一条线段上),试探究∠AFB与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,将
绕点A按逆时针方向旋转
得到
,且点
刚好落在
边上,
,若
,求
的旋转角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2991491eb4b7c9a9ad8954beca9fa963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a896e05730e8dd3bee64a4911c33dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/12c2fd70-b92b-473a-b1ff-296dee4c03a6.png?resizew=129)
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