如图,在
中,
,请用尺规作图法在
上求作一点
,使得
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca0eb89ff7961c4bc2766e094b86e3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/d8356cd0-414f-40a6-93de-f145f8a45efc.png?resizew=128)
更新时间:2024-01-26 23:20:44
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相似题推荐
解答题-证明题
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【推荐1】【阅读材料】
【解答问题】
(1)请根据材料中的信息.证明四边形
是菱形.
(2)如果
,
,求菱形
的面积.
(3)只利用尺规,你还有其他方法做出菱形
吗?(写出一种,保留作图痕迹.不写做法).
问题: 已知:如图 ![]() 求作:菱形 ![]() ![]() ![]() 分别在 ![]() ![]()
| 小明的作法: (1)以 ![]() ![]() ![]() ![]() (2)以 ![]() ![]() ![]() ![]() (3)连接 ![]() 四边形 ![]()
|
(1)请根据材料中的信息.证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)只利用尺规,你还有其他方法做出菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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【推荐2】如图,在△ABC中,∠A=∠B=30°.
(1)尺规作图:在线段AB上找一点O,以O为圆心作圆,使⊙O经过B,C两点.
(2)求证:AC与(1)中所做的⊙O相切.
(1)尺规作图:在线段AB上找一点O,以O为圆心作圆,使⊙O经过B,C两点.
(2)求证:AC与(1)中所做的⊙O相切.
![](https://img.xkw.com/dksih/QBM/2022/1/10/2891281773297664/2892040197865472/STEM/e96ded35-61ee-433f-9492-b6c249432bd6.png?resizew=191)
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解答题-作图题
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【推荐3】如图,在
中,
.
边的垂直平分线
,交
于点
,交
于点
,连接
.(要求:尺规作图,不写作法,保留作痕迹)
(2)若
,求
的度数,请根据以下的思路完成下列填空.
解:∵
,
∴① (等边对等角)
又∵
是
的垂直平分线
∴② (中垂线的性质)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea251f051a6503ef60e1ca7f215a2436.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
∴③ (等量代换)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58ec06f141c41987ffbf1ff18607fd8.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2a8124001ae703a113063612edfdc1.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72fd2d501d9620e65ecca91137aa7a3.png)
∴
④
(三角形的内角和为
)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee54b9b398ce80cd054b56173fe810f0.png)
由上述证明可得:在等腰三角形(腰长大于底边长)中,作一条腰的中垂线交另一腰于一点,当此点与此等腰三角形顶点的距离与底边长度相等时,则这个等腰三角形的顶角为⑤ 度,人们称具有此特征的等腰三角形为“黄金三角形”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3582fb22962d70a3fa88e259e9736892.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
∴① (等边对等角)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴② (中垂线的性质)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea251f051a6503ef60e1ca7f215a2436.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
∴③ (等量代换)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58ec06f141c41987ffbf1ff18607fd8.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2a8124001ae703a113063612edfdc1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72fd2d501d9620e65ecca91137aa7a3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a436def651ae23a430f4d398539d78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f93d83b189be99ae2a41b777c7dde2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee54b9b398ce80cd054b56173fe810f0.png)
由上述证明可得:在等腰三角形(腰长大于底边长)中,作一条腰的中垂线交另一腰于一点,当此点与此等腰三角形顶点的距离与底边长度相等时,则这个等腰三角形的顶角为⑤ 度,人们称具有此特征的等腰三角形为“黄金三角形”.
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解答题-问答题
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名校
【推荐1】问题探究.
(1)如图①,在锐角
中,
为
内一动点,连接
、
、
,将
绕点
逆时针旋转
得到
,连接
、
、
.比较大小:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/564b9718-2095-4ebe-a2cb-6884a01f054a.png?resizew=221)
①
______
.
②
______
.
(2)如图②,在平面直角坐标系中,已知
,以
为边在第一象限内作等边三角形
,求点
的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/373e4b2f-dd52-4ba1-990d-f740cc95ee0c.png?resizew=144)
(3)问题解决.
如图③,直线为一条河流,
、
为两个村庄,现要在河边空地上选一处
修建一个水厂,在河边选一处
将河里的水由
处(
)运输到水厂D经过处理后,输送给
、
两个村庄,为了降低运输费用,应使管道总长度
最小,要解决这个问题,以直线
为
轴建立平面直角坐标系,若
,
,请求出
的最小值,并写出此时点
的坐标.
(1)如图①,在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72877c13ed193e20096b533378d9c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/564b9718-2095-4ebe-a2cb-6884a01f054a.png?resizew=221)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971f3e94e0fa1ba97c8ada159591eb90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292324d48d8e5cb06ffa7db4c3ec62bd.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971f3e94e0fa1ba97c8ada159591eb90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
(2)如图②,在平面直角坐标系中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c0813ffee858d72c088375b58797d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa16146cb21f11693feffb0876c0795b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/373e4b2f-dd52-4ba1-990d-f740cc95ee0c.png?resizew=144)
(3)问题解决.
如图③,直线为一条河流,
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87320eb4a1c31ad4ffc15ccb2855a6cf.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/8e47247587199dde2eee6e11dd5cbf85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0693b34e767ea963d4a75863c072d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eefd60482c04b38a4e0438313efd47b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e47247587199dde2eee6e11dd5cbf85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/f7e3ae72-ea3a-438d-8599-d5837067ea07.png?resizew=219)
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【推荐2】如图,在
中,
,
,点P从点A开始沿
边向B点以
的速度移动,点Q从点B开始沿
边向点C以
的速度移动,如果点P,Q分别从A,B同时出发,问经过几秒钟,
与
相似.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d4bc1be051f904d4a6e06dc825395b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693e880a887e72fd09251f326a90cc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/33c00d7d-daee-4e70-b025-f2183afd1861.png?resizew=193)
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