已知,如图四边形
是平行四边形,对角线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634d6f7a95c2c1484be3324e5a53953c.png)
,
的垂直平分线,不写作法,保留作图痕迹;
(2)若
的垂直平分线交
于点
,交
于点
,交
于点
,连接
,
.若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634d6f7a95c2c1484be3324e5a53953c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862730f28c12750ebea0af5edcac5fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cffa4e36fe8d98132b2df4536589643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e41003131c669f518bc8485620486fa.png)
更新时间:2024-05-20 23:56:07
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解答题-证明题
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【推荐1】如图,OE,OF分别是△ABC中AB,AC边的中垂线(即垂直平分线),∠OBC,∠OCB的平分线相交于点I,试判定OI与BC的位置关系,并给出证明.
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600450607652864/2602183114285056/STEM/b21f10267b094deb9f39d09977e87b52.png?resizew=116)
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【推荐2】已知如图,在△ABC中,D是BC的中点.过点D的直线GF交AC于点F,交AC的平行线BG于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/c49fda55-1d5b-407e-8d82-3b5b89974705.png?resizew=182)
(1)试说明BG=CF.
(2)若DE⊥GF交AB于点E,连接EF,试判断BE+CF与EF之间的大小关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/c49fda55-1d5b-407e-8d82-3b5b89974705.png?resizew=182)
(1)试说明BG=CF.
(2)若DE⊥GF交AB于点E,连接EF,试判断BE+CF与EF之间的大小关系,并说明理由.
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【推荐3】综合与实践
问题情境:数学活动课上,老师提出如下问题:如图1,在正方形
中,
是对角线
上一点,将直线
以点
为中心逆时针旋转
,旋转后的直线与
交于点
.求证:
.
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989162953564160/2991221060370432/STEM/fa7c6bc9-d07b-42ab-8599-afd23bc07254.png?resizew=440)
(1)问题解决:
请你解决老师提出的问题;
(2)数学思考:
如图2,“兴趣小组”的同学将
沿射线
的方向平移到
,点
的对应点为
.连接
.他们认为:
,
.他们的认识是否正确?请说明理由.
(3)创新探究
“创新小组”在“兴趣小组”所提问题的基础上,又提出如下新问题,请你思考并解决该问题:如图3,若
垂直平分
,
,则线段
的长度是______.(直接写出答案即可)
问题情境:数学活动课上,老师提出如下问题:如图1,在正方形
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5989e32f69a053f4042737e3d663e931.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989162953564160/2991221060370432/STEM/fa7c6bc9-d07b-42ab-8599-afd23bc07254.png?resizew=440)
(1)问题解决:
请你解决老师提出的问题;
(2)数学思考:
如图2,“兴趣小组”的同学将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ce5a662ac2480a0b6aded7f9d38911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef8d4792c62c0dcf35004df43a25d5d.png)
(3)创新探究
“创新小组”在“兴趣小组”所提问题的基础上,又提出如下新问题,请你思考并解决该问题:如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐1】有两张相同的矩形纸片ABCD和A′B′C′D′,其中AB=3,BC=8.
(1)若将其中一张矩形纸片ABCD沿着BD折叠,点A落在点E处(如图1),设DE与BC相交于点F,求BF的长;
(2)若将这两张矩形纸片交叉叠放(如图2),判断四边形MNPQ的形状,并证明.四边形MNPQ的最大面积是_________.(直接写出结果)
(1)若将其中一张矩形纸片ABCD沿着BD折叠,点A落在点E处(如图1),设DE与BC相交于点F,求BF的长;
(2)若将这两张矩形纸片交叉叠放(如图2),判断四边形MNPQ的形状,并证明.四边形MNPQ的最大面积是_________.(直接写出结果)
![](https://img.xkw.com/dksih/QBM/2019/6/8/2221097206710272/2221930634452992/STEM/39d934a9d99f42a3b63f673706912a1c.png?resizew=355)
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【推荐2】如图,
是正方形
的对角线
上的两点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(1)求证:四边形
是菱形:
(2)若正方形边长为
求菱形
的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](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/d8ce1475f537b4ad21775bfaa16daa0c.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)若正方形边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13de051c1f9be9f2c807a34933748345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/2344a958-d858-4b8e-93dd-dcca6506453d.png?resizew=126)
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