如图,
中,
,
是
上一点(
与
不重合).
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894805721432064/2933857442856960/STEM/86b1c716-8fbe-4afc-9c10-0f1a6864a4f5.png?resizew=120)
(1)尺规作图:过点
作
的垂线
交
于点
.作
的平分线
交
于点
,交
于点
(保留作图痕迹,不写作法);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894805721432064/2933857442856960/STEM/86b1c716-8fbe-4afc-9c10-0f1a6864a4f5.png?resizew=120)
(1)尺规作图:过点
![](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/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/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cbd1d4bdcf1199ec44f9ba5348ac42.png)
更新时间:2022-03-11 12:11:09
|
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解答题-作图题
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适中
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【推荐1】已知a,b,c是
的三边长.
(1)画出
的边
上的高;
(2)尺规作图:画出
的平分线,保留作图痕迹;
(3)化简:
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(1)画出
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(2)尺规作图:画出
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(3)化简:
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您最近一年使用:0次
解答题-作图题
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适中
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名校
【推荐2】如图,在直角三角形ABC中,
(1)过点A作AB的垂线与∠B的平分线相交于点D
(要求:尺规作图,保留作图痕迹,不写作法);
(2)若∠A=30°,AB=2,则△ABD的面积为 .
(1)过点A作AB的垂线与∠B的平分线相交于点D
(要求:尺规作图,保留作图痕迹,不写作法);
(2)若∠A=30°,AB=2,则△ABD的面积为 .
![](https://img.xkw.com/dksih/QBM/2018/10/1/2043866853220352/2044490515472384/STEM/5b881dce58e84cf9955204c31a081141.png?resizew=128)
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解答题-作图题
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【推荐1】如图,海中有一个小岛A,该岛四周
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,
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解答题-作图题
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适中
(0.65)
名校
【推荐2】图,四边形ABCD为矩形,AC为对角线,过点D作
于点E.
![](https://img.xkw.com/dksih/QBM/2022/5/22/2984724356743168/2987088184254464/STEM/ec218176-3768-47b0-875c-3f8bbe996b6a.png?resizew=173)
(1)尺规作图:过点B作AC的垂线BF,垂足为F点.(保留作图痕迹不写作法)
(2)在(1)的条件下,已知
,求BF的长.
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(1)尺规作图:过点B作AC的垂线BF,垂足为F点.(保留作图痕迹不写作法)
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解答题-作图题
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适中
(0.65)
名校
【推荐3】阅读下列材料并完成相应的任务:
工人师傅有一块不规则的模板,他已经在模板上画出了一条裁割线AB,现根据木板的情况,需要通过AB上一点C,作AB的垂线,进行裁割,但手头没有直角尺,怎么办呢?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/b4301b57-b5da-4823-87b2-13565f967108.png?resizew=538)
方法一:取卷尺在AB上量出CD=30cm,然而分别以D,C为圆心,以50cm与40cm为半径画圆弧,两弧相交于点E,作直线CE,则∠DCE=90°;
方法二:在绳子EF上割取任意长度a,一端记点P,另一端记为点Q,将P点与C点重合,按如图位置摆放,然后以Q为圆心,PQ的长为半径画弧,交AB于点R,连接RQ,并延长到点M使得QM=QR,连接CM,则∠MCR=90°.
任务:(1)方法一依据的数学原理是 .
(2)利用方法2,证明∠MCR=90°;
(3)不用直角尺,你还有什么方法做出垂线吗?
尺规作图:请在木板上,过点C作出AB的垂线L(保留作图痕迹,不写作法).
工人师傅有一块不规则的模板,他已经在模板上画出了一条裁割线AB,现根据木板的情况,需要通过AB上一点C,作AB的垂线,进行裁割,但手头没有直角尺,怎么办呢?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/b4301b57-b5da-4823-87b2-13565f967108.png?resizew=538)
方法一:取卷尺在AB上量出CD=30cm,然而分别以D,C为圆心,以50cm与40cm为半径画圆弧,两弧相交于点E,作直线CE,则∠DCE=90°;
方法二:在绳子EF上割取任意长度a,一端记点P,另一端记为点Q,将P点与C点重合,按如图位置摆放,然后以Q为圆心,PQ的长为半径画弧,交AB于点R,连接RQ,并延长到点M使得QM=QR,连接CM,则∠MCR=90°.
任务:(1)方法一依据的数学原理是 .
(2)利用方法2,证明∠MCR=90°;
(3)不用直角尺,你还有什么方法做出垂线吗?
尺规作图:请在木板上,过点C作出AB的垂线L(保留作图痕迹,不写作法).
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
,
,点
在
上,
在
上,当
时.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2903992396472320/2928922691608576/STEM/b5193fb5-5ad1-411f-bb29-e1d1979448d0.png?resizew=347)
(1)求证:
;
(2)探究
与
有怎样的数量关系?并证明你的结论.
(3)当
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)求证:
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(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54071d324f5b8f05d4afade9effffbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e8ecb371ce77dca5554e8e03b41386.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】【感知】(1)如图,在
中,
,
,
,
是中线,点E、F同时从点D出发,以相同的速度分别沿
方向移动,当点E到达点C时,运动停止,直线
分别与
、
相交于G、H.
证明:
.
【探究】(2)证明:点A、C、G、D均在以
为直径的圆上.
【拓展】(3)在点E、F移动过程中,点G移动路线的长度为 .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baeea1e4b495eac58570e5bc3e9ab4af.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
证明:
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【探究】(2)证明:点A、C、G、D均在以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【拓展】(3)在点E、F移动过程中,点G移动路线的长度为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/77b3002f-e61f-4006-9e09-c11a37b199ff.png?resizew=226)
您最近一年使用:0次