题型:解答题-问答题
难度:0.65
引用次数:26
题号:22822039
如图,在
中,
,垂足为
,
,延长
至
,使得
,连接
.
;
(2)若
,
,求
的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03ca3e334c5290ab28b4b4a883c90c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84436aa1ceaa333f6236c35b6eb63ec0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
更新时间:2024-05-15 21:24:04
|
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解答题-作图题
|
适中
(0.65)
【推荐1】阅读与思考:在数学活动课上,老师提出了这样一个问题:如图1,已知锐角
,
是
边上一点,利用尺规作图在
边上求作点
,使
.小明同学想到了如下的方法,并完成了部分证明.
方法:①如图2,分别以点
,
为圆心,大于
的长为半径画弧,两弧分别相交于点
,
;②作直线
,交
于点
,交
于点
;③连接
.则点
即为所求.
证明:如图3,连接
,
,
,
.
由作图可知,
,
.
∴点
,
均在线段
的垂直平分线上.(依据1)
∴直线
是线段
的垂直平分线.(依据2)
……
(1)上述证明过程中的“依据1”和“依据2”分别指什么?
(2)请将上述证明过程补充完整.
(3)尺规作图:请在图1中,用不同于小明的方法求作点
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d56d044efeffa76f2c2a4c0bd260a98.png)
方法:①如图2,分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e4818b793ca69be2b85918ab05e9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
证明:如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
由作图可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a12e3fc18f8bb1015bcc772b99b273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70da7465a47de95fcf7be6dbf68e5de1.png)
∴点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
……
(1)上述证明过程中的“依据1”和“依据2”分别指什么?
(2)请将上述证明过程补充完整.
(3)尺规作图:请在图1中,用不同于小明的方法求作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/78cd7955-ce11-4594-81af-c977e2efc750.png?resizew=589)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在直角△ABC中,∠C=90°,DE垂直平分AB,交BC于点D、交AB于点E.
(1)若AD平分∠CAB,则∠B的度数是 度;
(2)若AB=10,△ACD的周长为14,求△ACB的周长.
(1)若AD平分∠CAB,则∠B的度数是 度;
(2)若AB=10,△ACD的周长为14,求△ACB的周长.
![](https://img.xkw.com/dksih/QBM/2017/12/19/1841734252847104/1843790391853056/STEM/ce08689a68e145c9abf1c2aad3f47275.png?resizew=209)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,
中,
,点
、
在
边上,
.
(1)如图1,求证:
;
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577908447313920/2578685309878272/STEM/13d1bcf5bc954200b23f1403096bdbac.png?resizew=175)
(2)如图2,若点
在
的垂直平分线上,
,直接写出图中所有的等腰三角形(
、
除外).
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc2450dc300ce26b513c2abae28cab.png)
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577908447313920/2578685309878272/STEM/13d1bcf5bc954200b23f1403096bdbac.png?resizew=175)
(2)如图2,若点
![](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/9666188e21ea5c4b24d5248e87dc7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577908447313920/2578685309878272/STEM/45654a6eb09649599d6114d4a598e942.png?resizew=175)
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解答题-问答题
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名校
【推荐2】如图,在△ABC中,AB=AC,∠BAC=40°,AD是BC边上的高.线段AC的垂直平分线交AD于点E,交AC于点F,连接BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/c465f4aa-18c1-4c53-ac25-e5d0959ecf60.png?resizew=128)
(1)填空:∠BAD的度数为______;∠ABC的度数为______;∠ACB的度数为______;
(2)试问:线段AE与BE的长相等吗?请说明理由;
(3)求∠EBD的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/c465f4aa-18c1-4c53-ac25-e5d0959ecf60.png?resizew=128)
(1)填空:∠BAD的度数为______;∠ABC的度数为______;∠ACB的度数为______;
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解答题-问答题
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适中
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【推荐1】如图,已知△ABC中,AB=BC,AC=2,cosA=
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(1)求BC与BC边上高的长;
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解答题-证明题
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适中
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【推荐2】已知:在△ABC中AB=AC,点D在CB的延长线上.求证:
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