定义:我们把对角线长度相等的四边形叫做等线四边形.
(1)尝试:如图1,在
的正方形网格图形中,已知点
、点
是两个格点,请你作出一个等线四边形,要求
、
是其中两个顶点,且另外两个顶点也是格点;
(温馨提示:请画在答题卷相对应的图上)
(2)推理:如图2,已知
与
均为等腰直角三角形,
,连结
,
,求证:四边形
是等线四边形;
(3)拓展:如图3,已知四边形
是等线四边形,对角线
,
交于点
,若
,
,
,
.求
的长.
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751906117451776/2766079039758336/STEM/663cc4e1-f12b-41df-b5cc-2e49e12908b3.png)
(1)尝试:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(温馨提示:请画在答题卷相对应的图上)
(2)推理:如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f5f078c32f5caf439bac951d450fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4962343ca7d065aee473dbf79eb8d3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d576adc579a512b4537a7568d125cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)拓展:如图3,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/36c3b184adb06f96bacedc27c6b21b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba56b41fe702d9b6433e4d01e48d69a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751906117451776/2766079039758336/STEM/663cc4e1-f12b-41df-b5cc-2e49e12908b3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751906117451776/2766079039758336/STEM/d46426a7-c3c4-4a27-bc1a-7eda22808038.png)
20-21八年级下·浙江湖州·期末 查看更多[3]
浙江省湖州市南浔区2020-2021学年八年级下学期期末数学试题(已下线)第2章 特殊三角形(基础、典型、易错、压轴)分类专项训练-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)(已下线)浙江八年级上学期期末【压轴75题考点专练】-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)
更新时间:2021-07-17 11:05:07
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解答题-证明题
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【推荐1】如图,已知⊙O的半径长为1,AB、AC是⊙O的两条弦,且AB=AC,BO的延长线交AC于点D,连接OA、OC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/fb262688-b84a-42f3-a0c6-9d75ae61b980.png?resizew=357)
(1)求证:△OAD∽△ABD;
(2)当△OCD是直角三角形时,求B、C两点的距离;
(3)记△AOB、△AOD、△COD的面积分别为S1、S2、S3,如果S22=S1•S3,试证明点D为线段AC的黄金分割点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/fb262688-b84a-42f3-a0c6-9d75ae61b980.png?resizew=357)
(1)求证:△OAD∽△ABD;
(2)当△OCD是直角三角形时,求B、C两点的距离;
(3)记△AOB、△AOD、△COD的面积分别为S1、S2、S3,如果S22=S1•S3,试证明点D为线段AC的黄金分割点.
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名校
【推荐2】如图1,△ABC中,
,点O是△ABC内一点,且
.
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929015442194432/2932970248396800/STEM/57b815b2-0923-4985-bf2b-af5aad8ff0f6.png?resizew=183)
(1)试说明:
.
(2)如图2,延长BO交边AC于点D,当△BCD满足BC=BD时:
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929015442194432/2932970248396800/STEM/99f0a30c-f781-48b7-8683-6a7abf72ef72.png?resizew=186)
①求∠BCD的大小.
②将△ABD沿BD翻折到△EBD,边BE交AC于点F,若
,
,请用含m的代数式表示AD的长.(直接写出结果,不用写说明理由)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242b14a89363fa1e1a3b74ed989a5311.png)
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929015442194432/2932970248396800/STEM/57b815b2-0923-4985-bf2b-af5aad8ff0f6.png?resizew=183)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a84626620bf774f64d3e00778ecee9d.png)
(2)如图2,延长BO交边AC于点D,当△BCD满足BC=BD时:
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929015442194432/2932970248396800/STEM/99f0a30c-f781-48b7-8683-6a7abf72ef72.png?resizew=186)
①求∠BCD的大小.
②将△ABD沿BD翻折到△EBD,边BE交AC于点F,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762df784415af17493e62d83136a634e.png)
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929015442194432/2932970248396800/STEM/3a50b567-6eb0-434b-8136-218ff48c67d3.png?resizew=204)
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【推荐1】如图1,把一个含45°角的直角三角板ECF和一个正方形ABCD摆放在一起,使三角板的直角顶点和正方形的顶点C重合,点E、F分别在正方形的边CB、CD上,连AF
取AF的中点M,EF的中点N,连接MD、MN.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881475738517504/2945357659684864/STEM/49d7e70d-f2f1-49b0-9468-8b4cfcd9a553.png?resizew=327)
(1)请判断MD与MN之间的数量关系,直接写出结论;
(2)将图1中的直角三角板ECF绕点C顺时针旋转180°得到图2,其他条件不变,则(1)中的结论还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)连接DN,若AB=3,CE=2,将图1中的直角三角板ECF绕点C在平面内自由旋转,其他条件不变,请直接写出△DMN面积的最大值和最小值.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881475738517504/2945357659684864/STEM/66c22e876f6446cc861445be1fb5be8e.png?resizew=3)
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881475738517504/2945357659684864/STEM/49d7e70d-f2f1-49b0-9468-8b4cfcd9a553.png?resizew=327)
(1)请判断MD与MN之间的数量关系,直接写出结论;
(2)将图1中的直角三角板ECF绕点C顺时针旋转180°得到图2,其他条件不变,则(1)中的结论还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)连接DN,若AB=3,CE=2,将图1中的直角三角板ECF绕点C在平面内自由旋转,其他条件不变,请直接写出△DMN面积的最大值和最小值.
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【推荐2】如图,
和
都是等三边三角形,连接
,以
,
为邻边作平行四边形
,连接
.
(1)如图①,当点
在
上时,求证:
;
(2)将图①中的
绕点
逆时针旋转,如图②,(1)的结论是否成立?说明理由;
(3)若
,
,将
绕点
逆时针旋转一周,当
,
,
三点共线时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9186e4574ffe28e673724fcb019db208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
(1)如图①,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3620030e8808da46df97330103827913.png)
(2)将图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b285934db0cd25f729d8eb2ab4b8524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64e0206b1814c35cc96bd2b6b12239a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520429657489408/2520816125411328/STEM/c959be395aff44cbaddd1b316bc4177c.png?resizew=292)
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【推荐1】(1)[猜想]如图1,在
中,点C在优弧
上,连接
,得到圆心角
,发现,
与
对着同一条弧
,则
;
[特例探究]为证明图1中的结论,我们不妨使点O在
的边
上,如图2.若
,则
度;
(2)[证明结论]请结合图2的特例探究,用图1证明[猜想]中的结论;
(3)结论应用]在图1中,若
,点P在
上,且
是等腰三角形,直接写出该等腰三角形的顶角的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cebbe17ecbb71dd829bc082453abf03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f8d34f7ebd366337c6c70aead7412f.png)
[特例探究]为证明图1中的结论,我们不妨使点O在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b3887fdbe775493d5faf9ee67fa4679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
(2)[证明结论]请结合图2的特例探究,用图1证明[猜想]中的结论;
(3)结论应用]在图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14814fdc3ca8034bbd97cb76bed9c9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f717db3903d12095a2c6e0686a19ee1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/ff1074e1-c279-4838-81ca-bcbbb1288c19.png?resizew=286)
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【推荐2】在等边
中,点
,
分别在边
,
上.
(1)如图
,若
,以
为边作等边
,
交
于点
,连接
.
求证:①
;
②
平分
.
(2)如图
,若
,作
,
交
的延长线于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8fe122a768a4d78b5b39817d557a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560652bdf3b43592a440bb1e60303c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852d91e88a1da79039f97ce694be7717.png)
![](https://img.xkw.com/dksih/QBM/2020/3/2/2410826368851968/2410921451593728/STEM/b22a97c2-77f4-47a4-8e30-b9258e830217.png)
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【推荐1】如图1,长方形ABCD中,AB=5,AD=12,E为AD边上一点,DE=4,动点P从点B出发,沿B→C→D以2个单位/s作匀速运动,设运动时间为t.
⑴ 当t为 s时,△ABP与△CDE全等;
⑵ 如图2,EF为△AEP的高,当点P在BC边上运动时,EF的最小值是 ;
⑶ 当点P在EC的垂直平分线上时,求出t的值.
⑴ 当t为 s时,△ABP与△CDE全等;
⑵ 如图2,EF为△AEP的高,当点P在BC边上运动时,EF的最小值是 ;
⑶ 当点P在EC的垂直平分线上时,求出t的值.
![](https://img.xkw.com/dksih/QBM/2019/11/19/2337068395397120/2338083053314048/STEM/7a9880451943454ba29d6129697dbd99.png?resizew=547)
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(0.4)
【推荐2】结合已经学过的“距离”我们知道:点到直线的“距离”是直线外一点和直线上各点连接的所有线段中最短的线段(即垂线段)的长度.类似的我们给出两个图形M、N的“距离”定义:如果点P为图形M上的任意一点,点Q为图形N上的任意一点,且P、Q两点的“距离”有最小值,那么称这个最小值为图形M,N的“距离”,记为
特别地,当图形M、N有公共点时,图形M,N的“距离”
.
(1)如图1,在平面直角坐标系中,
,若
,
,
,则
___________,
___________;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/05227f86-9b9c-4bb7-8a32-9a0d77422661.png?resizew=159)
(2)如图2,已知
的三个顶点的坐标分别为
,
,
,将一次函数
的图像记为L.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/3e4b11ce-9e23-465d-b560-9ad98460bb6f.png?resizew=159)
①若
,且
,求k的值;
②若
,求k的取值范围;
(3)在平面直角坐标系中,点O为坐标原点,点
为平面内一点,则
___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d7224242ab75080dfb394a39ebf7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2600016cf8b60bfba567d03e232f8a6.png)
(1)如图1,在平面直角坐标系中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95e84f5c91c910aaafc5e74dbfbdf59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ed90ebf0061c8a79beed307fc1719a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8350efd6636002f417d721fc87a126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a322dcf254b4dfb12764cd1db12af49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3fa921a6f6b433ca28f0e6b05eb306.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/05227f86-9b9c-4bb7-8a32-9a0d77422661.png?resizew=159)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c77a42750684cb6157c2c7fb9422a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a56e5ddc6dc057aa4076130cc6ce19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170785d8eaffa7cb618e52c4580e95fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/3e4b11ce-9e23-465d-b560-9ad98460bb6f.png?resizew=159)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134919798c2b4891125cec618752c2ce.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbace497586091a463b7d2a368b64530.png)
(3)在平面直角坐标系中,点O为坐标原点,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecd109effbc3f4df473dce112c1d1fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b701b262582b1564e7a8b66405552ed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/44be99ea-c32e-4725-9618-beffe9d323bc.png?resizew=107)
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