图1是某校教学楼墙壁上文化长廊中的两幅图案,现将这两个正方形转化为平面图形得到图2,并测得正方形
与正方形
的面积相等,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f49ca76644bee8f70e97e6376a1663b.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9f962e5527a0ab4d586b900d524929.png)
(1)判断四边形
的形状,并说明理由.
(2)求
的长.(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f49ca76644bee8f70e97e6376a1663b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9390a8688fd466fb6b883b0d60dcd872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9f962e5527a0ab4d586b900d524929.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/fb394e8c-d76f-4968-9676-ee749720ed21.png?resizew=263)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e18eb2d74e019b1fb18c3189508d9e.png)
更新时间:2023-08-15 10:51:46
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相似题推荐
解答题-作图题
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【推荐1】如图,在
的正方形网格中,每个小正方形的边长均为1,有线段
,点
、
均在小正方形的顶点上.
(1)以线段
为斜边作等腰
,画出
;
(2)以
为对角线作平行四边形
,画出平行四边形
,并求出平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d009739b5b5362c7902eeeada94adb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/23/4170c332-f722-4de4-b7a0-d92425c5cac3.png?resizew=150)
(1)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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【推荐2】如图,E、F是四边形ABCD的对角线AC上两点,AE=CF,DF∥BE,DF=BE.
(1)求证:四边形ABCD是平行四边形;
(2)若AC平分∠BAD,求证:▱ABCD为菱形.
(1)求证:四边形ABCD是平行四边形;
(2)若AC平分∠BAD,求证:▱ABCD为菱形.
![](https://img.xkw.com/dksih/QBM/2016/9/27/1574243049504768/1574243055738880/STEM/895f16e4a56f4139a070f32266989f08.png)
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解答题-证明题
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【推荐1】如图,在
中,
,点D是
的中点,
.
(1)求证:四边形
是菱形;
(2)若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49938ca6628df6a0e2f71434802990b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13346dbf7de2f2cfd7e444db276a0308.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/18fe4f11-1a0d-457d-9799-ecbe01711671.png?resizew=201)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
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解答题-证明题
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【推荐2】如图,
是
的中线,点
是
的中点,连接
并延长至点
,使
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/acb3a2f5-1bbe-435a-8a17-1fa1b2413f96.png?resizew=233)
(1)求证:四边形
是平行四边形;
(2)当
时,判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c97d73a687d728eb0b265d389c5d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b073cb71194ba9c0187c21ba78a617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/acb3a2f5-1bbe-435a-8a17-1fa1b2413f96.png?resizew=233)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb511e0a5d9918d382a1b811e290930.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300aefd67369742e2b1ddcdc02dd495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae3d5543f586b351d59c0ffc26a12cc.png)
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解答题-证明题
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【推荐1】如图,点P在正方形ABCD的对角线AC上,点E在边BC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/133d5eb6-05ec-465e-95a4-6374abf461a9.png?resizew=129)
(1)求证:
;
(2)连接DE,试探究
的形状,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4144f6ce108867d237f6891b4f4954.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/133d5eb6-05ec-465e-95a4-6374abf461a9.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bfc6b5683ec1919f8257765ce056b7.png)
(2)连接DE,试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
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解答题-证明题
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【推荐2】【教材重现】以下是苏科版八(下)数学教材第94页第19题第(1)(2)问.
在正方形
中:
(1)如图1,如果点E、F分别在
上,且
,垂足为M,那么
与
相等吗?证明你的结论;
(2)如图2,如果点E、F、G分别在
上,且
,垂足为M,那么
与
相等吗?证明你的结论;
与
是否相等?不必说明理由;
(2)完成教材中的第(2)问的解答;
【变式探究】
(3)如图3,当M点恰好是
的中点时,对角线
交
于点H,判断
与
的数量关系,并证明.
在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)如图1,如果点E、F分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)如图2,如果点E、F、G分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3f97ffd6f04c0bb04b3f76494ee302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de97dfb4a50e1e852ac0d09c3605d1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)完成教材中的第(2)问的解答;
【变式探究】
(3)如图3,当M点恰好是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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解答题-计算题
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【推荐1】如图①所示的旅行箱的箱盖和箱底两部分的厚度相同,四边形ABCD为形如矩形的旅行箱一侧的示意图,F为AD的中点,EF∥CD.现将放置在地面上的箱子打开,使箱盖的一端点D靠在墙上,O为墙角,图②为箱子打开后的示意图.箱子厚度AD=30cm,宽度AB=50cm.
(1)图②中,EC=________cm,当点D与点O重合时,AO的长为________cm;
(2)若∠CDO=60°,求AO的长(结果取整数值,参考数据:sin60°≈0.87,cos60°=0.5,tan60°≈1.73,可使用科学计算器).
(1)图②中,EC=________cm,当点D与点O重合时,AO的长为________cm;
(2)若∠CDO=60°,求AO的长(结果取整数值,参考数据:sin60°≈0.87,cos60°=0.5,tan60°≈1.73,可使用科学计算器).
![](https://img.xkw.com/dksih/QBM/2017/10/11/1799325531865088/1810160938590208/STEM/b2ecc917b2234bd09a6cff4ce853a492.png?resizew=281)
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解答题-证明题
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【推荐2】如图,在
中,
是直径,
是弦,点C在
上,
于点E,
,交
的延长线于点F,且
.
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702ecb879bdebc1f9c5444feccd2ecfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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