已知四边形ABCD和AEFG均为正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/ac409d51-567f-4096-81f8-ac574eb7c3a4.png?resizew=308)
(1)观察猜想:如图1所示,当点A、B、G三点在一条直线上时,连接BE、DG,则线段BE与DG的数量关系是 ,位置关系是 .
(2)类比探究:如图2所示,将正方形AEFG在平面内绕点A逆时针旋转到图2时,则(1)的结论是否成立,若成立,请证明,若不成立,请说明理由;
(3)拓展延伸:在(2)的条件下,将正方形AEFG在平面内绕点A任意旋转,若
,
,则BE的最大值为 ,最小值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/ac409d51-567f-4096-81f8-ac574eb7c3a4.png?resizew=308)
(1)观察猜想:如图1所示,当点A、B、G三点在一条直线上时,连接BE、DG,则线段BE与DG的数量关系是 ,位置关系是 .
(2)类比探究:如图2所示,将正方形AEFG在平面内绕点A逆时针旋转到图2时,则(1)的结论是否成立,若成立,请证明,若不成立,请说明理由;
(3)拓展延伸:在(2)的条件下,将正方形AEFG在平面内绕点A任意旋转,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
更新时间:2022-08-31 09:52:15
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相似题推荐
解答题-作图题
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名校
【推荐1】如图,在平面直角坐标系中,
的三个顶点的坐标分别为
,
,
.
(1)在图中作出
关于y轴的对称图形
.
(2)求
的面积.
(3)在x轴上画出点P,使
最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6646e758862a34d89ee14de8a1ea13b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5593ca86a1f7ad0cbcc801c3cb77f285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e61dd6cbb403ec51f5af91bd0e351b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/3c1ab07e-cec7-4e07-aa83-6d384daf64b4.png?resizew=258)
(1)在图中作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在x轴上画出点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
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解答题-作图题
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【推荐2】如图是一条河
是河边
外一点,
是河边
上一码头.
走到码头
,请在图1中作出最短路线示意图.
(2)现欲用水管从河边
将水引到
处,请在图2上作出所需水管最短的铺设方案.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
(2)现欲用水管从河边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-证明题
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适中
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【推荐1】如图,
,
,垂足分别为B、C.
,
,
与
交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/9b2dc3f4-22b9-4599-bc9d-4577c7ea9110.png?resizew=161)
(1)求证:
;
(2)求证:
;
(3)连接
,则图中共有______________对全等三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e06ba7dd49252ed56e99b20af3bc74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e53ccf0b1a5129577d9776652d47a8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/9b2dc3f4-22b9-4599-bc9d-4577c7ea9110.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27a1d9528c827ce9ae25df4017597ca.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】【问题探究】如图1,锐角△ABC中,分别以AB、AC为边向外作等腰直角△ABE和等腰直角△ACD,使AE=AB,AD=AC,∠BAE=∠CAD=90°,连接BD,CE,试猜想BD与CE的大小关系,不需要证明.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/6b5e1b8c-8ad5-47ad-b728-630c17ed75fa.png?resizew=179)
【深入探究】如图2,锐角△ABC中,以AB为边在AB的右侧作等腰直角△ABE,以AC为边在AC的左侧作等腰直角△ACD,使AE=AB,AD=AC,∠BAE=∠CAD=90°,连接BD,CE,试猜想BD与CE的大小关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/ab128f83-9b47-4cf0-aa84-3f9e23257445.png?resizew=181)
【变式思考】(1)如图1,四边形ABCD中,AB=2
cm,BC=2cm,∠ABC=∠ACD=∠ADC=45°,则BD的长=______.(直接写出答案)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/77db57ec-7f72-4ee6-9a5f-6de3f9a308d3.png?resizew=173)
(2)如图3,在(1)的条件下,当△ACD在线段AC的左侧时,请求出BD的长.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/6b5e1b8c-8ad5-47ad-b728-630c17ed75fa.png?resizew=179)
【深入探究】如图2,锐角△ABC中,以AB为边在AB的右侧作等腰直角△ABE,以AC为边在AC的左侧作等腰直角△ACD,使AE=AB,AD=AC,∠BAE=∠CAD=90°,连接BD,CE,试猜想BD与CE的大小关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/ab128f83-9b47-4cf0-aa84-3f9e23257445.png?resizew=181)
【变式思考】(1)如图1,四边形ABCD中,AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/77db57ec-7f72-4ee6-9a5f-6de3f9a308d3.png?resizew=173)
(2)如图3,在(1)的条件下,当△ACD在线段AC的左侧时,请求出BD的长.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960644832034816/2961510655361024/STEM/35c730db-b1c9-4693-afb8-c35e05f1363b.png?resizew=128)
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解答题-证明题
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【推荐1】如图,在正方形
中,
的中点分别为E,F,连接
交于点G,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f0bac668bec74590e5795044f35a1a.png)
平分
交
于H.
(1)探索
与
的关系;
(2)求证:点H为
中点;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb213d76eaae189a3283eb360ac2983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f0bac668bec74590e5795044f35a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7a82bf203df79ba6c0ef80026198d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/ca218d59-7d8e-4019-8970-13b7f003b8ef.png?resizew=156)
(1)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求证:点H为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690e8b84625fe89e3b4c49102662e08.png)
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解答题-证明题
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【推荐2】如图,
是正方形
内的一点,连接
,将线段
绕点
顺时针旋转
,得到线段
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/ace61e95-c815-40e6-9ed2-62bb2e8bb533.png?resizew=252)
(1)如图①,求证
;
(2)如图②,延长
交直线
于点
,交
于点
,求证
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/ace61e95-c815-40e6-9ed2-62bb2e8bb533.png?resizew=252)
(1)如图①,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cef8a8475f7648015b30046933840a.png)
(2)如图②,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5339d50826a2bbf18b23fafe86f15d.png)
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【推荐1】如图,在
中,
,
,将
绕点
按逆时针方向旋转得到
,当点
恰好在
边上,连
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b185184dc2dc3894a0313fd13f26a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa80ee3df4da58e1d1e42b58140f3f9.png)
![](https://img.xkw.com/dksih/QBM/2020/5/21/2467730227511296/2468156481970176/STEM/26ca8ffa1d874f06846c40d1f971c068.png?resizew=160)
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解答题-证明题
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【推荐2】如图,点M,N分别在正方形
的边
上,且
.把
绕点A顺时针旋转
得到
.
.
(2)若
,求正方形
的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4794cf7c57bdd4825d9e6615e2527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eda61683bb1d4d62441f0625097b477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362af923b80962478deb74abb55b3e78.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91e1e20baa416427b120fbee8100c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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