如图,在
中,
,射线CD交AB于点D,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/24c71e17-5bc4-4472-bc94-f709326c13c4.png?resizew=196)
(1)作图:只用圆规在射线CD上作出点E,使
(保留作图痕迹,不写作法);
(2)在(1)的条件下连接BE,若
,
,求AC长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/24c71e17-5bc4-4472-bc94-f709326c13c4.png?resizew=196)
(1)作图:只用圆规在射线CD上作出点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b405a122ded2eb0395d5434892ae7b45.png)
(2)在(1)的条件下连接BE,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c551f300c4aae81c310392dfd8405299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c609ef5724ce0c56b303fbb61c37645.png)
更新时间:2023-04-24 16:13:23
|
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解答题-作图题
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适中
(0.65)
【推荐1】已知:线段AB,BC,∠ABC=90°.
请用两种方法求作:矩形ABCD.(要求:用直尺和圆规作图,不写作法,保留作图痕迹)
请用两种方法求作:矩形ABCD.(要求:用直尺和圆规作图,不写作法,保留作图痕迹)
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解答题-作图题
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适中
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名校
【推荐2】尺规作图:求作一点
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全等,要求:画出所有符合题意的点
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解答题-作图题
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【推荐1】如图,已知
.
边上作一点
,使
的周长等于
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(2)在(1)的条件下,若
,
,求AD长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(2)在(1)的条件下,若
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解答题-问答题
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【推荐2】如图,∠AOB=90°,C,D是
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![](https://img.xkw.com/dksih/QBM/2017/12/3/1830632939659264/1834236306767872/STEM/75390971-4373-435d-be43-d7bc705ab510.png?resizew=168)
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(1)错因: .
(2)纠错:____________________________________________________________
.
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(1)错因: .
(2)纠错:____________________________________________________________
.
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解答题-证明题
|
适中
(0.65)
【推荐1】已知,在
中,
,
.在
内部作
,
交
于点D.将一个含有45°角的三角板
如图放置,使直角边
与
重合,三角板
沿
平移.
(1)如图1,当三角板
的另一条直角边
过点A时,试证明
;
(2)将三角板
沿
平移至图2的位置,
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交于点M,过点M作
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3b37020a1975e5133c3971645f2849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/5971ad81-7bf6-48bf-a9f8-e9f0596fabc9.png?resizew=313)
(1)如图1,当三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2546e21ce1b5a67fa80adc8da5d9ac72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
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(2)将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2546e21ce1b5a67fa80adc8da5d9ac72.png)
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解答题-证明题
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适中
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【推荐2】如图,在
中,
,
平分
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作
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的延长线于点
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.
(1)求证:
;
(2)若
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,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(2)若
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解答题-作图题
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适中
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【推荐1】我们给出如下定义:若一个四边形中存在相邻两边的平方和等于一条对角线的平方,则称这个四边形为勾股四边形,这两条相邻的边称为这个四边形的勾股边.
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(2)如图1,已知格点(小正方形的顶点)O(0,0),A(3,0),B(0,4),请你画出以格点为顶点,OA,OB为勾股边且对角线相等的勾股四边形OAMB;
(3)如图2,将△ABC绕顶点B按顺时针方向旋转60°,得到△DBE,连接AD,DC,∠DCB=30度.求证:DC2+BC2=AC2,即四边形ABCD是勾股四边形.
(1)写出你所学过的特殊四边形中是勾股四边形的两种图形的名称正方形、长方形、直角梯形(任选两个均可);
(2)如图1,已知格点(小正方形的顶点)O(0,0),A(3,0),B(0,4),请你画出以格点为顶点,OA,OB为勾股边且对角线相等的勾股四边形OAMB;
(3)如图2,将△ABC绕顶点B按顺时针方向旋转60°,得到△DBE,连接AD,DC,∠DCB=30度.求证:DC2+BC2=AC2,即四边形ABCD是勾股四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/e2460b09-1248-47b5-a4a2-87fe17cc2226.png?resizew=414)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图.在
中.弦
垂直于半径
.垂足为E.D是优弧
上一点.连接
、
、
,
.
(1)求
的度教;
(2)若弦
.求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/770792ef-8301-4d2c-b76f-ed352b313772.png?resizew=140)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)若弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
您最近一年使用:0次