综合与实践
问题情境:如图1,正方形纸片
和
有公共顶点
,其中
.将正方形
绕点
按顺时针方向旋转
.
观察发现:
(1)如图2,当
时,连接
,小组成员发现
与
存在一定的关系,其数量关系是______________,位置关系是__________________.
探索研究:
(2)当
三点共线时,请在图3中画出图形,并直接写出此时
的长度.
拓展延伸:
(3)猜想图3中
与
的数量关系并证明.
问题情境:如图1,正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0016a780b64dc21f123dd2a8a6a4d2b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8f03ea13934e8fd597d2dae9b66bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/8c95fcd9-8668-4054-a31a-8820ffd1feb1.png?resizew=766)
观察发现:
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480888079e87df2b1c0734114a594d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c233f7e711dc825e61f605f79a86f6a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
探索研究:
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8e45b50c77bf6a2cde628ea3455ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
拓展延伸:
(3)猜想图3中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
更新时间:2023-06-22 11:53:11
|
相似题推荐
解答题-证明题
|
困难
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【推荐1】如图1,已知△ABC是等腰直角三角形,∠BAC=90°,点D是BC的中点,作正方形DEFG,使点A、C分别在DG和DE上,连接AE、BG,易证BG=AE且BG⊥AE.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992791017889792/3071973032214528/STEM/0c6ee9419b1b4870998deb43cd14d34d.png?resizew=485)
(1)如图2,将正方形DEFG绕点D逆时针方向旋转α(0°<α≤90°),试猜想线段BG和AE的数量关系和位置关系,并说明理由.
(2)将正方形DEFG绕点D逆时针方向旋转α(900<α≤3600),
①判断(1)中的结论是否仍然成立?请利用图3证明你的结论;
②若BC=DE=6,当AE取最大值时,求AF的值及此时α的度数.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992791017889792/3071973032214528/STEM/0c6ee9419b1b4870998deb43cd14d34d.png?resizew=485)
(1)如图2,将正方形DEFG绕点D逆时针方向旋转α(0°<α≤90°),试猜想线段BG和AE的数量关系和位置关系,并说明理由.
(2)将正方形DEFG绕点D逆时针方向旋转α(900<α≤3600),
①判断(1)中的结论是否仍然成立?请利用图3证明你的结论;
②若BC=DE=6,当AE取最大值时,求AF的值及此时α的度数.
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【推荐2】在正方形
中,将线段BA绕着点B旋转α(
),得到线段
,连接
.
(1)如图1,若
,连接
,求证:
;
(2)如图2,若
,过点A作
交
延长线于点G,连接
,
,猜想线段
之间存在的数量关系,并证明你的猜想;
(3)如图3,在线段
旋转的过程中,直线
交于点M,过点A作
交直线
于点G,直线
交于点N.若
,当线段
取得最小值时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824513ba3c12cec2601b75e831e8b4de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/351beda3-d536-46d1-9885-89085c86f61c.png?resizew=521)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b75ced646be2a6bb12d2077b2e2427e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f19889892fad9cfb3fa18eba971fb52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10307f49b923a8cb397d77d76075d05.png)
(3)如图3,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673e677c7ce6ef5fbbeda5eb47f56210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f19889892fad9cfb3fa18eba971fb52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874f18ad047c9a53dc2b62c4683881e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5aedb7470128f1782be91f5f444a6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadd960fdef00a1100d4a49b69edcb6c.png)
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解答题-证明题
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【推荐1】已知正方形ABCD中AC与BD交于点,点M在线段BD上,作直线AM交直线DC于E,过D作DH⊥AE于H,设直线DH交AC于N.
(1)如图1,当M在线段BO上时,求证:MO=NO;
(2)如图2,当M在线段OD上,连接NE和MN,当EN//BD时,
①求证:四边形DENM是菱形;
②求证:BM=AB;
(3)在图3,当M在线段OD上,连接NE,当NE⊥BC时,求证:AN2=NC
AC.
(1)如图1,当M在线段BO上时,求证:MO=NO;
(2)如图2,当M在线段OD上,连接NE和MN,当EN//BD时,
①求证:四边形DENM是菱形;
②求证:BM=AB;
(3)在图3,当M在线段OD上,连接NE,当NE⊥BC时,求证:AN2=NC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://img.xkw.com/dksih/QBM/2020/9/15/2550437130354688/2555480409235458/STEM/0874510494c34e478ba861aa02c5cca8.png?resizew=451)
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【推荐2】已知正方形
,
是
边上一点,过点
作
交
的延长线于点
,交
的延长线于点
.
,则线段
之间有怎样的数量关系: (直接写出结论);
(2)如图2,如果过点
作
交
的延长线于点
,那么
,请说明理由;
(3)如图3,在(2)的条件下,过点
作
于点
,连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd33dcb66a0a342ec072456dac06659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1a6e42aa77ba929cb1384211f6e564.png)
(2)如图2,如果过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3f6141b4d267187f855681592b16a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875e60688276eba6b0b9235b43257bbe.png)
(3)如图3,在(2)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f1054e3a5c0fc7dca3d285108112c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bb1b34ba0a8c480f55dad078456663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
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解答题-证明题
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【推荐1】如图,边长为6的正方形ABCD中,E为AB中点,P为BC上一点(不与B、C重合),将△BPE沿直线PE翻折,点B落在B' 处,直线PB'交射线AD于点Q,连接EQ,设BP=a.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011639021568/2982590243438592/STEM/8bbfcf7c-29cb-4189-aeed-c7b7a53ee5d6.png?resizew=421)
(1)求证:∠PEQ=90°;
(2)设
的值为y,用含a的代数式表示y并求出y的最大值;
(3)若F为BC中点,设过点F且垂直于BC的直线被直角三角形PEQ截得的线段长为d,请直接写出d与a的关系式.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011639021568/2982590243438592/STEM/8bbfcf7c-29cb-4189-aeed-c7b7a53ee5d6.png?resizew=421)
(1)求证:∠PEQ=90°;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e568f3d9d38a12ed3346b743b5120b4.png)
(3)若F为BC中点,设过点F且垂直于BC的直线被直角三角形PEQ截得的线段长为d,请直接写出d与a的关系式.
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【推荐2】已知
,点D为直线
上的一个动点(点D不与点B重合),连接
,以
为一边构造
,使
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/13e61f3c-0fee-469a-a1da-0f8e73eefb03.png?resizew=456)
(1)如图1,当
时,直接写出线段
与线段
的数量关系与位置关系∶
①数量关系:________;
②位置关系:_________;
(2)如图2,当
时,请猜想线段
与线段
的数量关系与位置关系,并说明理由;
(3)如图3,在(2)的条件下,连接
,分别取线段
,
的中点M,N,连接
,若
,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9014a50c22034b954d27eb439dd1dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c50d6d16f99c65005dfb950c30d760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/13e61f3c-0fee-469a-a1da-0f8e73eefb03.png?resizew=456)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d424e8afd4ebb5eeffab0a4ea7f067a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①数量关系:________;
②位置关系:_________;
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a04975f7cf3298fffdf9227cb8a1ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52cf9f88a70988e4fd851cf4e1efb1ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c7830300c0794dc4feeb2def250b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
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【推荐1】如图1,在直角梯形ABCD中,AD
BC,∠D=90°,AD=9cm,CD=12cm,BC=15cm.点P由点C出发沿CA方向匀速运动,速度为1cm/s;同时,线段EF由AB出发沿AD方向匀速运动,速度为1cm/s,且与AC交于Q点,连接PE,PF.当点P与点Q相遇时,所有运动停止.若设运动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/5e1a2114-64f3-45a5-a1a4-c221ae395483.png?resizew=363)
(1)求AB的长度;
(2)当PE
CD时,求出t的值;
(3)①设△PEF的面积为S,求S关于t的函数关系式;
②如图2,当△PEF的外接圆圆心O恰在EF的中点时,则t的值为 .(直接写出答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/5e1a2114-64f3-45a5-a1a4-c221ae395483.png?resizew=363)
(1)求AB的长度;
(2)当PE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(3)①设△PEF的面积为S,求S关于t的函数关系式;
②如图2,当△PEF的外接圆圆心O恰在EF的中点时,则t的值为 .(直接写出答案)
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【推荐2】如图,在平行四边形ABCD中,AB=5,BC=10,F为AD的中点,连接CF,并延长CF、BA交于G点,CE⊥AB于E,设∠ABC=α(60°≤α<90°).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/b5e863f0-3c3d-4b68-b41d-12de9422bfc8.png?resizew=252)
(1)当α=60°时,求CE的长;
(2)当60°<α<90°时,
①求证:∠EFD=3∠AEF;
②当CE2﹣CF2取最大值时,求BE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/b5e863f0-3c3d-4b68-b41d-12de9422bfc8.png?resizew=252)
(1)当α=60°时,求CE的长;
(2)当60°<α<90°时,
①求证:∠EFD=3∠AEF;
②当CE2﹣CF2取最大值时,求BE的长.
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