如图,△ABC中,∠ACB=90°,将△ABC沿着一条直线折叠后,使点A与点C重合(如图②)
(1)在图①中画出折痕所在的直线l,问直线l是线段AC的 线;
(2)设直线l与AB、AC分别相交于点M、N,连结CM,若△CMB的周长是21cm,AB=14cm,求BC的长.
(1)在图①中画出折痕所在的直线l,问直线l是线段AC的 线;
(2)设直线l与AB、AC分别相交于点M、N,连结CM,若△CMB的周长是21cm,AB=14cm,求BC的长.
![](https://img.xkw.com/dksih/QBM/2020/2/6/2392954133471232/2393412575911936/STEM/f088479333014641aa3276d09b112f04.png?resizew=405)
19-20八年级上·福建厦门·期中 查看更多[2]
福建省厦门市思明区厦门第一中学2019-2020学年八年级上学期期中数学试题(已下线)第07讲 轴对称、画轴对称图形(3大考点15种解题方法)-2022-2023学年八年级数学考试满分全攻略(人教版)
更新时间:2020-02-06 22:33:15
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【推荐1】如图,在
中,
是高,
,
是角平分线,
交
于点
,
,
.
(1)
______°;
(2)若
,
,求
的面积;
(3)作图:在线段
上求作一点
,使得
最小(保留作图痕迹).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84494e057cb7bc129257c4cb962678ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76ffd241623ec4ee9fd08876464def3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/f64919c6-2508-47d2-9d06-0ef6d72c599a.png?resizew=146)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
(3)作图:在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adea4583d4d55cae7f36fd531821d087.png)
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【推荐2】已知矩形OABC在平面直角坐标系如图所示,点A坐标为(0,a),点C坐标为(c,0),且
.
(1)求点B的坐标;
(2)点P从点O出发沿x轴向右以1个单位/秒的速度运动,设运动时间为t秒(t>0). 在点P运动过程中,设△PAC的面积为S,用含有t的代数式表示S;
(3)在(2)的条件下,将△APO沿AP翻折得到△APD,射线AD交直线BC于点E,在点P运动过程中,连接PE,当 AP=PE,求t值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a982b02cbe45219592f29d6b1b3ed48.png)
(1)求点B的坐标;
(2)点P从点O出发沿x轴向右以1个单位/秒的速度运动,设运动时间为t秒(t>0). 在点P运动过程中,设△PAC的面积为S,用含有t的代数式表示S;
(3)在(2)的条件下,将△APO沿AP翻折得到△APD,射线AD交直线BC于点E,在点P运动过程中,连接PE,当 AP=PE,求t值.
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179260728475648/2185773283409920/STEM/d519f1a3308c477b9f7b2ed04c9c3a8e.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179260728475648/2185773283409920/STEM/b5c7d53facab43b5b49863de50a5993b.png?resizew=161)
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解答题-作图题
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【推荐1】已知
,用无刻度的直尺和圆规完成以下作图(不写作法,保留作图痕迹).
,在
边上求作点D,连接
,使得
;
(2)如图2,若
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(3)如图3,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9560cc1f22e8f9b36cd4161161c0b433.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914320e1e549e89ff6d5b885ac63d9b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7777a27259d26724229b604df42656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc69be185d383828cdd90f0b24e793e.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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解答题-作图题
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【推荐2】如图,在等腰
和
中,
,请仅用无刻度直尺完成以下作图.(保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696124765863936/2698056624316416/STEM/c306ba6f-4ed7-4d20-a2de-a4f4d9ec5e0d.png)
(1)在图1中,作出
的边
上的高
.
(2)在图2中,作出
的边
上的中线
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)在图1中,作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)在图2中,作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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