如图,矩形
和
,
.
画出矩形
绕点
逆时针旋转
后的矩形
,并写出
的坐标为________,点
运动到点
所经过的路径的长为________;
若点
的坐标为
,则点
的坐标为________,请画一条直线
平分矩形
与
组成图形的面积(保留必要的画图痕迹).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbb12f2db15d2b6ed815942e36f1255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f35d4ede5b91b03d09a99262de2693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06624c6ef1965e412cc7cb50812e3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://img.xkw.com/dksih/QBM/2018/10/31/2065424658767872/2068108149899264/STEM/f59a2760fafe4aeb973d7a2864e8f64c.png?resizew=125)
更新时间:2018-11-04 07:59:42
|
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解答题-证明题
|
适中
(0.65)
【推荐1】已知:△ABC和△ADE是两个不全等的等腰直角三角形,其中AB=AC,AD=AE,
∠BAC=90°,∠DAE=90°.
(1)观察猜想
如图1,连接BE、CD交于点H,再连接CE,那么BE和CD的数量关系和位置关系分别是
(2)探究证明
将图1中的△ABC绕点A逆时针旋转到图2的位置时,分别取BC、CE、DE的中点P、M、Q,连接MP、PQ、MQ,请判断MP和MQ的数量关系和位置关系,并说明理由;
(3)拓展延伸
已知AB=
,AD=4,在(2)的条件下,将△ABC绕点A旋转的过程中,若∠CAE=45°,请直接写出此时线段PQ的长.
∠BAC=90°,∠DAE=90°.
(1)观察猜想
如图1,连接BE、CD交于点H,再连接CE,那么BE和CD的数量关系和位置关系分别是
(2)探究证明
将图1中的△ABC绕点A逆时针旋转到图2的位置时,分别取BC、CE、DE的中点P、M、Q,连接MP、PQ、MQ,请判断MP和MQ的数量关系和位置关系,并说明理由;
(3)拓展延伸
已知AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/e4ca02cb-091e-475b-bda5-dd4c03ddec3a.png?resizew=537)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图1,四边形ABCD,边AD、BC的垂直平分线相交于点O.连接OA、OB、OC、OD.OE是边CD的中线,且∠AOB+∠COD=180°
(1)如图2,当△ABO是等边三角形时,求证:OE=
AB;
(2)如图3,当△ABO是直角三角形时,且∠AOB=90°,求证:OE=
AB;
(3)如图4,当△ABO是任意三角形时,设∠OAD=α,∠OBC=β,
①试探究α、β之间存在的数量关系?
②结论“OE=
AB”还成立吗?若成立,请你证明;若不成立,请说明理由.
(1)如图2,当△ABO是等边三角形时,求证:OE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)如图3,当△ABO是直角三角形时,且∠AOB=90°,求证:OE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)如图4,当△ABO是任意三角形时,设∠OAD=α,∠OBC=β,
①试探究α、β之间存在的数量关系?
②结论“OE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2020/3/6/2413553933664256/2413866798899200/STEM/5f4e7d8502ce4d34a5b6d0ae5b0f6f91.png?resizew=456)
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解答题-证明题
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适中
(0.65)
【推荐1】
绕点C逆时针旋转角
得
,连结
、
.
交
于点D,
交
、
于点E、点F.
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/a623eb0a25614386baafb41c56e33f46.png)
(1)在图中不添加其它任何线段的情况下,请你找出一对全等三角形,并加以证明.(
全等除外);
(2)当
是等腰三角形时,求
.
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/60f9f758f42647d482e9e61314467ed4.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/2452f204015b4fe3b82a545afcb41685.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/e7bf8503d59c4904b69f18b75497a82d.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/189a01407af647749387ebc0befa7fcc.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/f680ba41281b4a019142e22e03e1337f.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/f680ba41281b4a019142e22e03e1337f.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/dd2e6104571647509cf1926a3f51342b.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/bf91aadd6c36435da4613ec419b04572.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/dd2e6104571647509cf1926a3f51342b.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/76d11f02ae2a4142a3564ef498c97ae4.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/a623eb0a25614386baafb41c56e33f46.png)
(1)在图中不添加其它任何线段的情况下,请你找出一对全等三角形,并加以证明.(
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/de9730b3e02c48bcbe7c34859c222cb6.png)
(2)当
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/2accd8a79e2d459c8a701d9a2607c471.png)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1573662177714176/1573662183997440/STEM/fa0426ffe8a141d996e6eefcad6b61f5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
名校
【推荐2】如图,
中,
,D、E分别是边
、
的中点.将
绕点E旋转180度,得
.
![](https://img.xkw.com/dksih/QBM/2020/7/17/2507662305812480/2507742355955713/STEM/67b75f13-001b-4e20-8ebc-8e03553c1ef8.png)
(1)判断四边形
的形状,并证明;
(2)已知
,
,求四边形
的面积S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://img.xkw.com/dksih/QBM/2020/7/17/2507662305812480/2507742355955713/STEM/67b75f13-001b-4e20-8ebc-8e03553c1ef8.png)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92d220be10b55272aab5bacd9f69721.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8193721d69dd37abbfafae5f8b63f990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92d220be10b55272aab5bacd9f69721.png)
您最近一年使用:0次