综合与实践
活动课上,老师让同学们翻折正方形
进行探究活动,同学们经过动手操作探究,发展了空间观念,并积累了数学活动经验.
【问题背景】如图1,过点A引射线
,交边
于点H(点H与点D不重合).通过翻折,使点B落在射线
上的点G处,折痕
交
于E,延长
交
于F.
(1)如图2,当点H与点C重合时,
与
的大小关系是______;
是______三角形.
(2)如图3,当点H为边
上任意一点时(点H与点C不重合),连接
,猜想
与
的数量关系,并说明理由.
(3)在(2)条件下,当
,
时,CF的长为______.
活动课上,老师让同学们翻折正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
【问题背景】如图1,过点A引射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)如图2,当点H与点C重合时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c333f2e1769473c6ada9790f841572.png)
(2)如图3,当点H为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
(3)在(2)条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
更新时间:2024-01-13 18:24:35
|
相似题推荐
解答题-证明题
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适中
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【推荐1】如图,在△ABC中,∠ACB=90°,AC=BC,D为边BC上的一点,连接AD,过点C作AD的垂线,交过点B与边AC平行的直线于点E,CE交边AB于点F.
(1)求∠EBF的度数;
(2)求证:△ACD≌△CBE;
(3)若AD平分∠BAC,判断△BEF的形状,并说明理由.
(1)求∠EBF的度数;
(2)求证:△ACD≌△CBE;
(3)若AD平分∠BAC,判断△BEF的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071119067144192/2075567902277633/STEM/054fdca1529948519b3e5ffd40c8280c.png?resizew=174)
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解答题-证明题
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【推荐2】如图所示,已知点D是等边三角形ABC的边BC延长线上的一点,∠EBC=∠DAC,CE∥AB.求证:△CDE是等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/5692162d-dedb-495a-9436-81b5b8d11a82.png?resizew=196)
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解答题-计算题
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适中
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名校
【推荐1】动物园猴山上有两棵树,如图
和
是它们的示意图,它们都分别垂直于地面
和
,树顶都有一根缆绳
和
与地面相连.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/9933173e-4916-4618-b522-f6299667116c.png?resizew=296)
(1)如图1,在树
上点
处有一只猴子,
米,
米,若猴子爬下树,再走到点
的路程,和爬上树顶再沿着缆绳爬到达点
的路程相等,求树
的高度.
(2)如图2,在树
上
处也有一只猴子,若缆绳
与地面的夹角为
,
米,
米,那么猴子沿
的路线还是沿
的路线更近,试通过计算进行比较.(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/9933173e-4916-4618-b522-f6299667116c.png?resizew=296)
(1)如图1,在树
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693ad2a4a6090727e232e51e6ac9ee03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,在树
![](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/a6655e2fa64a32cd12fe0279afd65d73.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f708ba8b731e6718cb733d5ae3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04345cb07ac170308a6ac55e284e6b47.png)
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解答题-作图题
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适中
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【推荐2】正方形
中,M为边CB延长线上一点,过点A作直线AM,设∠BAM=α,点B关于直线AM的对称点为点E,连接AE、DE,DE交AM于点N.
(1)依题意补全图形;当α=30°时, 直接写出∠AND的度数;
(2)当α发生变化时,∠AND的度数是否发生变化?说明理由;
(3)探究线段AN,EN,DN的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)依题意补全图形;当α=30°时, 直接写出∠AND的度数;
(2)当α发生变化时,∠AND的度数是否发生变化?说明理由;
(3)探究线段AN,EN,DN的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243921081368576/2244552921219072/STEM/373b42bf5256445d9a4a6c787228f16f.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243921081368576/2244552921219072/STEM/f31b665e1cf944f8b84cd2ea3451e186.png?resizew=223)
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解答题-问答题
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名校
【推荐1】如图,在
中,
,其顶点
为坐标原点,点
在第二象限,点A在
轴负半轴上,若
于点
,
,
.求点A,
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a80d4477c5fa6dc0a2f61003cf060a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fdfa5407cfa15978f3557cacdf27c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df8db810ca567bd6fd958c1b857bc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70834818750d0454474ac7c357cd287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9d99759db551f3136f161998db7d9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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解答题-证明题
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【推荐2】如图,在
中,对角线
交于点O,过点A作
于点E,延长
到点F,使
,连接
.
是矩形;
(2)连接
,若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a893fc8b2e9d55c9cdf8aceb3827a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9351e70f7b776e953e3c6263a570de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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解答题-作图题
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【推荐1】如图1,在正方形ABCD中,点F在边BC上,过点F作EF⊥BC,且FE=FC(CE<CB),连接CE、AE,点G是AE的中点,连接FG.
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904021752938496/2904729251643392/STEM/77ed604557ec47389ecaf4593291e2f1.png?resizew=470)
(1)用等式表示线段BF与FG的数量关系: ;
(2)将图1中的△CEF绕点C按逆时针旋转,使△CEF的顶点F恰好在正方形ABCD的对角线AC上,点G仍是AE的中点,连接FG、DF.
①在图2中,依据题意补全图形;
②用等式表示线段DF与FG的数量关系并证明.
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904021752938496/2904729251643392/STEM/77ed604557ec47389ecaf4593291e2f1.png?resizew=470)
(1)用等式表示线段BF与FG的数量关系: ;
(2)将图1中的△CEF绕点C按逆时针旋转,使△CEF的顶点F恰好在正方形ABCD的对角线AC上,点G仍是AE的中点,连接FG、DF.
①在图2中,依据题意补全图形;
②用等式表示线段DF与FG的数量关系并证明.
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解答题-证明题
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【推荐2】如图,点G是正方形
对角线
的延长线上任意一点,以线段
为边作一个正方形
,线段
和
相交于点H.
;
(2)判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9417a225e219fbccae8c565e3541c0c.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
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