如图,在
中,
,按以下步骤作图:①分别以点A和点B为圆心,大于
一半的长为半径作圆弧,两弧相交于点M和点N,作直线
,交
于点D.②分别以点A和点C为圆心,大于
一半的长为半径作圆弧,两弧相交于点P和点Q,作直线
,交
于点E;③连结
、
.若
,则
的大小为__________ 度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cdee6c0ca0767830201ff7c2bfcb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
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23-24八年级上·吉林长春·期末 查看更多[2]
吉林省长春市南关区2023-2024学年八年级上学期期末数学试题(已下线)专题1.9 线段垂直平分线(知识梳理与考点分类讲解)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2024-01-11 09:06:17
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【推荐1】已知:
、
是
的高,直线
、
相交所成的角中有一个角为
,则
的度数为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
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【推荐1】如图,△ABC中,AB=AC,∠A=45°,AC的垂直平分线分别交AB,AC于D,E两点,连接CD,如果AD=1,那么tan∠BCD=_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/e724c888-3d23-45f0-aa63-98a1bc02953a.png?resizew=129)
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【推荐2】如图,已知∠MON=120°,点A,B分别在OM,ON上,且OA=OB=a,将射线OM绕点O逆时针旋转得到OM′,旋转角为α(0°<α<120°且α≠60°),作点A关于直线OM′的对称点C,画直线BC交OM′于点D,连接AC,AD,则有:(1)AD=__ CD(填数量关系);(2)△ACD面积的最大值为_____ .
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179335164616704/2186007557357568/STEM/6daccba0-fed8-4a00-9d69-fba21013bba9.png?resizew=203)
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【推荐1】如图,在
中,
,分别以点A,B为圆心,以大于
长为半径画弧,两弧交于点D,E.作直线
,交
于点M.分别以点A,C为圆心,以大于
长为半径画弧,两弧交于点F,G.作直线
,交
于点N,连接
,
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa9879b33becfb45396c85a84576871.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef3cbd24068f3e17f0ca998fc478570a.png)
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【推荐2】如图,在平面直角坐标系中,四边形
是平行四边形,按以下步骤作图:①分别以点
和点
为圆心,以大于
的长为半径画弧,两弧相交于点
和
;②作直线
交
于点
,交
于点
.若点
的坐标为
,点
的坐标为
,则点
的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】我国古代天文学确定方向的方法中蕴藏了平行线的作图法.如《淮南子天文训》中记载:“正朝夕:先树一表东方;操一表却去前表十步,以参望日始出北廉.日直入,又树一表于东方,因西方之表,以参望日方入北康.则定东方两表之中与西方之表,则东西也.”如图,用几何语言叙述作图方法:已知直线
和直线外一定点
,过点
作直线与
平行.
(1)以
为圆心,单位长为半径作圆,交直线
于点
,
;
(2)分别在
的延长线及
上取点
,
,使
;
(3)连接
,取其中点
,过
,
两点确定直线
,则直线
.
按以上作图顺序,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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(1)以
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
按以上作图顺序,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b200fe18732fb56ec5bfa57965d20cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
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名校
【推荐2】点P是矩形
的对角线
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,
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________ 度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8eda53a0160a822dc8be2f135971e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/7b743a18-f3bc-436c-923b-0e716863ccda.png?resizew=230)
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