如图,已知
是等边三角形,边长为
平分
交
于点
.
(1)尺规作图:在线段
上找一点
,使得
;(不要求写作法,保留作图痕迹)
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300e12921930534a61e81f977363440f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/eb878e84-d6b0-4d0c-b6cf-91a5269b696e.png?resizew=181)
(1)尺规作图:在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b05d9ee604f5301e17e31094590324.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
2023·广东中山·模拟预测 查看更多[2]
更新时间:2023-06-07 21:03:40
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解答题-作图题
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【推荐1】作图题:国庆节期间小红外出游玩时看到了映山红拼成的“70”字样,还有两个花坛
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结论为:____________.
![](https://img.xkw.com/dksih/QBM/2019/11/20/2344267478138880/2346691903856640/STEM/abdb10a6a3914dceaf5861bf9291b9ad.png?resizew=176)
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解答题-作图题
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【推荐2】如图,在平行四边形
中,E是
上一点.
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下方作
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交
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(1)用尺规完成以下基本操作:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】已知:在△ABC中,AC=7.
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【推荐2】在
中,
,
,以BC、AC为边向
外作等边
和等边
.
(1)如图1,连接AD、BE,AD与BE相交于点O.
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929001410084864/2931098095575040/STEM/fe138694-1fbf-440d-8b05-db457b532956.png?resizew=165)
①说明
的理由.
②
______°.(直接填答案)
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(1)如图1,连接AD、BE,AD与BE相交于点O.
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①说明
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②
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【推荐1】如下图所示,在Rt△ACB中,∠BCA=90°,CD是斜边上的高,∠ACD=30°,AD=1,求AC,CD,BC,BD,AB的长.
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【推荐2】如图,将矩形ABCD的四边BA、CB、DC、AD分别延长至E、F、G、H,使得
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【推荐3】某校测绘社团欲利用周末时间测量学校附近某建筑物AB上的广告牌BC的高度,受条件的限制,无法直接测量该广告牌的高度.小亮给出如下方案:如图,在建筑物正前方找一点D,使得在D处测得广告牌上端C的仰角为30°,同时测得广告牌下端B的仰角α,然后在垂直于建筑物方向上找一点E,使得在E处测得广告牌上端C的仰角为60°,测量D,E间的距离m,然后根据测得的数据即可求出广告牌的高度.经实地测量α为26°,m为20米.你认为小亮的方案可行吗?如果可行,请你帮助他们计算出广告牌BC的高度;如果不可行,请说明理由.(结果精确到0.1 m,参考数据:tan26°≈0.49,sin26°≈0.44,cos26°≈0.90,
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