如图,在平行四边形
中,
的平分线交
于点
,交
的延长线于
,以
、
为邻边作平行四边形
.
(1)证明:平行四边形
是菱形;
(2)若
,连结
、
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613d648ab11bb6336d31fa508fd7515b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/f145cbba-9097-4958-8073-74c9fea9d4d4.png?resizew=285)
(1)证明:平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613d648ab11bb6336d31fa508fd7515b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbaff54b14910886cfaa1a89a37a233.png)
更新时间:2020-10-11 09:25:37
|
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【推荐1】小宇同学将一张长方形纸片ABCD按如图所示的方式折叠,EF,EG为折痕.问题:
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、
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、
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(1)
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(2)直线FA'与
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(3)试猜测么
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9097f4b0bb0037c006e587945dc78a19.png)
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【推荐2】在如图所示的方格纸中,每个小正方形的边长为1,每个小正方形的顶点都叫做格点,已知点A、B、C都在格点上.
(1)按下列要求画图:过点B和一格点D画AC的平行线BD,过点C和一格点E画BC的垂线CE,并在图中标出格点D和E;
(2)求三角形ABC的面积.
(1)按下列要求画图:过点B和一格点D画AC的平行线BD,过点C和一格点E画BC的垂线CE,并在图中标出格点D和E;
(2)求三角形ABC的面积.
![](https://img.xkw.com/dksih/QBM/2019/2/20/2144697392005120/2145692382855168/STEM/de4e349351354d699a460847621c6684.png?resizew=183)
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【推荐1】已知矩形
的对角线
、
相交于点O,点E是边
上一点,连接
、
、
,且
.
(1)如图1,求证:
;
(2)如图2,设
与
相交于点F,
与
相交于点H,过点D作
的平行线交
的延长线于点G,在不添加任何辅助线的情况下,请直接写出图2中的四个三角形(
除外),使写出的每个三角形的面积都与
的面积相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e94633285fd100c13a7cd4d13fad631.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/9b73e480-996f-4704-a10c-11d997805f15.png?resizew=402)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
(2)如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】如图,△ABC和△DBC中,∠ACB=∠DBC=90°,E是BC的中点,且ED⊥AB于点F,且AB=DE,CD交AB于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/a5235d51-a0e1-4ae6-8e24-4c73dfe46e08.png?resizew=167)
(1)求证:BD=2EC;
(2)求△ACM与△BCM的面积之比.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/a5235d51-a0e1-4ae6-8e24-4c73dfe46e08.png?resizew=167)
(1)求证:BD=2EC;
(2)求△ACM与△BCM的面积之比.
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名校
【推荐1】已知△ABC是等边三角形,点D是直线AB上一点,延长CB到点E,使BE=AD,连接DE,DC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/95dff81d-fdc1-4675-add8-175ea43c0f8e.png?resizew=415)
(1)如图①,若点D在线段AB上,且AB=6,AD=2,求证:DE=DC;并求出此时CD的长;
(2)如图②,若点D在线段AB的延长线上,此时是否仍有DE=DC?请证明你的结论;
(3)若点D在线段AB的延长线上,如图②,连接AE,若
,求CD: AE的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/95dff81d-fdc1-4675-add8-175ea43c0f8e.png?resizew=415)
(1)如图①,若点D在线段AB上,且AB=6,AD=2,求证:DE=DC;并求出此时CD的长;
(2)如图②,若点D在线段AB的延长线上,此时是否仍有DE=DC?请证明你的结论;
(3)若点D在线段AB的延长线上,如图②,连接AE,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fffdc8ca57aaadd63e0315d5df44922.png)
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真题
名校
【推荐2】如图,AB是⊙O的直径,点P是弦AC上一动点(不与A,C重合),过点P作PE⊥AB,垂足为E,射线EP交
于点F,交过点C的切线于点D.
![](https://img.xkw.com/dksih/QBM/2016/7/18/1574220243558400/1574220250021888/STEM/cbb7980c14d940fb9ec602dc61e4ef39.png?resizew=154)
(1)求证:DC=DP;
(2)若∠CAB=30°,当F是
的中点时,判断以A,O,C,F为顶点的四边形是什么特殊四边形?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c839d51fe4c70204d4aede5159da5502.png)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1574220243558400/1574220250021888/STEM/cbb7980c14d940fb9ec602dc61e4ef39.png?resizew=154)
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(2)若∠CAB=30°,当F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c839d51fe4c70204d4aede5159da5502.png)
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【推荐3】当图形具有邻边相等的特征时,我们可以把图形的一部分绕着公共端点旋转,这样将分散的条件集中起来,从而达到解决问题的目的.
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(1)如图1,等腰直角三角形ABC内有一点P,连接AP,BP,CP,∠APB=135°,为探究AP,BP,CP三条线段间的数量关系,我们可以将△ABP,绕点A逆时针旋转90°得到△ACP',连接PP',则PP'= AP,△CPP'是 三角形,AP,BP,CP三条线段的数量关系是 .
(2)如图2,等边三角形ABC内有一点P,连接AP、BP、CP,∠APB=150°,请借助第一问的方法探究AP、BP、CP三条线段间的数量关系.
(3)如图3,在四边形ABCD中,AD∥BC,点P在四边形的内部,且PD=PC,∠CPD=90°,∠APB=135°,AD=4,BC=5,请直接写出AB的长.
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864326553780224/2865859338371072/STEM/1e047114-acbd-4ecf-9097-eab971520155.png?resizew=367)
(1)如图1,等腰直角三角形ABC内有一点P,连接AP,BP,CP,∠APB=135°,为探究AP,BP,CP三条线段间的数量关系,我们可以将△ABP,绕点A逆时针旋转90°得到△ACP',连接PP',则PP'= AP,△CPP'是 三角形,AP,BP,CP三条线段的数量关系是 .
(2)如图2,等边三角形ABC内有一点P,连接AP、BP、CP,∠APB=150°,请借助第一问的方法探究AP、BP、CP三条线段间的数量关系.
(3)如图3,在四边形ABCD中,AD∥BC,点P在四边形的内部,且PD=PC,∠CPD=90°,∠APB=135°,AD=4,BC=5,请直接写出AB的长.
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【推荐1】如图,已知菱形ABCD的对角线相交于点
,延长AB至点E,使
,连结CE.
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497456814989312/2498033129881600/STEM/5caadf3e712348abadde955d4c1963da.png?resizew=193)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497456814989312/2498033129881600/STEM/5caadf3e712348abadde955d4c1963da.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ff95a85058f1803a7630c08c443df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ea50f4f106f524bbad70aebca7eff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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【推荐2】如图,图1,图2均为三个全等的等边三角形均匀排列组成的图形,请仅用无刻度的直尺按要求完成下列作图:
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584864031907840/2584971985174528/STEM/8b747294-0d3f-4d89-9ac1-019187950345.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584864031907840/2584971985174528/STEM/8c62aefe-6102-44f7-aaf9-2d48665065fc.png)
(1)在图1中作出该图形的一条对称轴;
(2)在图2中作出一个菱形,并使其面积等于其中一个三角形的面积.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584864031907840/2584971985174528/STEM/8b747294-0d3f-4d89-9ac1-019187950345.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584864031907840/2584971985174528/STEM/8c62aefe-6102-44f7-aaf9-2d48665065fc.png)
(1)在图1中作出该图形的一条对称轴;
(2)在图2中作出一个菱形,并使其面积等于其中一个三角形的面积.
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