如图,在边长为1的小正方形组成的网格中,△ABC的三个顶点均在格点上,请按要求完成下列各题:
![](https://img.xkw.com/dksih/QBM/2013/6/17/1573663618998272/1573663624290304/STEM/67040719e3cf4b539d361bf07a29c12d.png)
(1)请你通过计算说明△ABC的形状为___ _.;
(2)画线段AD∥BC且使AD =BC,连接CD.请你判断四边形ABCD的形状,并求出它的面积;
(3)若E为AC中点,则sin∠ABE=_______,cos∠CAD=____.
![](https://img.xkw.com/dksih/QBM/2013/6/17/1573663618998272/1573663624290304/STEM/67040719e3cf4b539d361bf07a29c12d.png)
(1)请你通过计算说明△ABC的形状为___ _.;
(2)画线段AD∥BC且使AD =BC,连接CD.请你判断四边形ABCD的形状,并求出它的面积;
(3)若E为AC中点,则sin∠ABE=_______,cos∠CAD=____.
更新时间:2016-12-05 18:09:45
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解答题-作图题
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【推荐1】如图,在△ABC中,∠B=40°,∠C=20°.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897801322233856/2899017782673408/STEM/3078b592-1051-4f7a-8e8e-a6cc097dec08.png?resizew=373)
(1)尺规作图:在BC边上作一点D,使点D到A、B两点的距离相等(要求:保留作图痕迹,不写作法);
(2)在(1)所作的图中,连接AD,AE是∠BAC的角平分线,求证△DAE为等腰三角形.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897801322233856/2899017782673408/STEM/3078b592-1051-4f7a-8e8e-a6cc097dec08.png?resizew=373)
(1)尺规作图:在BC边上作一点D,使点D到A、B两点的距离相等(要求:保留作图痕迹,不写作法);
(2)在(1)所作的图中,连接AD,AE是∠BAC的角平分线,求证△DAE为等腰三角形.
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解答题-证明题
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【推荐2】如图,在平行四边形ABCD中,CE是∠DCB的角平分线,且交AB于点E,DB与CE相交于点O,
(1)求证:△EBC是等腰三角形;
(2)已知:AB=7,BC=5,求
的值.
(1)求证:△EBC是等腰三角形;
(2)已知:AB=7,BC=5,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29195f2a8a3f07218eb7a230eca8d196.png)
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解答题-证明题
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【推荐1】如图,已知在
中,
于点
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/832f7d4e-770e-498f-97f5-2d8c2f7d07be.png?resizew=170)
(1)求
的长;
(2)求证:
是直角三角形.
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(1)求
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(2)求证:
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解答题-问答题
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【推荐2】阅读与思考
下面是薇薇同学看到的知识点内容,请仔细阅读并完成相应的任务.
任务:
(1)若
,
,则M,N两点间的距离为______.
(2)若
,
,
,请判断
的形状,并说明理由.
下面是薇薇同学看到的知识点内容,请仔细阅读并完成相应的任务.
对于平面直角坐标系中的任意两点![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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解答题-证明题
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【推荐1】如图1,在△ABC中,D、E分别为AB、AC的中点,延长BC至点F,使CF=
BC,连接CD和EF.
(1)求证:四边形DEFC是平行四边形.
(2)如图2,当△ABC是等边三角形且边长是8,求四边形DEFC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求证:四边形DEFC是平行四边形.
(2)如图2,当△ABC是等边三角形且边长是8,求四边形DEFC的面积.
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【推荐2】反比例函数
的图象经过点
,B是图象上在第一象限内的一个动点.
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(1)求反比例函数解析式;
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时B点的坐标;
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解答题-作图题
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【推荐1】如图,在
的正方形网格中,每个小正方形的边长都是1,△ABC的三个顶点都在格点(即小正方形的顶点)上
![](https://img.xkw.com/dksih/QBM/2012/1/9/1573328357662720/1573328405536768/STEM/03e1274c18cb42408266a1d9483c1ef1.png?resizew=121)
(1)画出线段AC平移后的线段BD,其平移方向为射线AB的方向,平移的距离为线段AB的长
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(1)画出线段AC平移后的线段BD,其平移方向为射线AB的方向,平移的距离为线段AB的长
(2)求sin∠DBC的值.
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【推荐2】如图,
为
的直径,四边形
内接于
.点D为
的中点,对角线
交于点E,
的切线
交
的延长线于点F,切点为A.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963815933779968/2965600369008640/STEM/a7721de9e18b47e7b863278a28142688.png?resizew=171)
(1)求证:
;
(2)若
,求
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(2)若
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