已知:P是正方形ABCD对角线BD上一点,PE⊥DC,PF⊥BC,E、F分别为垂足.
求证:AP=EF.
求证:AP=EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/82396e6e-31d4-4155-be43-6fba279d7c3a.png?resizew=132)
14-15八年级下·福建漳州·期末 查看更多[16]
2014-2015学年福建省漳州市龙海市八年级下学期期末数学试卷2016届山东省青岛市市南区九年级上期中数学试卷2015-2016学年江苏省扬州市江都二中八年级下期中数学试卷2017-2018学年湖北省咸宁市通山县南林中学八年级(下)第一次月考数学试卷甘肃省静宁县阿阳实验学校2017-2018学年八年级下学期期末考试数学试题山东省滨州市第一中学2018-2019学年度第二学期八年级数学期中测试题江西省吉安市七校联盟2019-2020学年九年级上学期期中数学试题(已下线)【万唯】陕西省真题-卷子-子卷21(已下线)期末模拟检测1-2020-2021学年八年级数学下学期期末专项复习(湘教版)山西省大同市杨高县2021-2022学年八年级下学期第二次学情监测(月考)数学试题河南省安阳市滑县2021-2022学年八年级下学期期中数学试题河北省沧州渤海新区京师学校2021-2022学年八年级下学期期中考试数学试题宁夏回族自治区吴忠市第四中学2022-2023学年八年级下学期期中数学试题吉林省松原市宁江区四校2022-2023学年八年级下学期期中数学试题湖北省襄阳市谷城县谷伯中学2021-2022学年八年级下学期期中数学试题新疆维吾尔自治区喀什地区2023-2024学年八年级下学期期末数学试题
更新时间:2016-12-06 02:50:49
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解答题-问答题
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适中
(0.65)
【推荐1】已知,图1是一辆登高云梯消防车的实物图,图2是其工作示意图,起重臂
可伸缩(
),且起重臂
可绕点A在一定范围内转动,张角为
(
),(转动点A距离地面
的高度
为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/e441f5bf-3f84-4df7-a2fe-3f3b374edfa9.png?resizew=320)
(1)当起重臂
长度为
,云梯消防车最高点C距离地面
的高度为
,求张角
的大小;
(2)已知该小区层高约为
,若某9楼居民家突发险情,请问云梯能否将消防员送达该楼层进行救援?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d888aa125789a3ef03ff785c90aac654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31ad83457da11190dcfb0f617023fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe024d6066f7e849846b19002ee0e739.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/e441f5bf-3f84-4df7-a2fe-3f3b374edfa9.png?resizew=320)
(1)当起重臂
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b749f9acb5f0de709a1709bbdd42614.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
(2)已知该小区层高约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5d6fb4ed1105299e1b0aa29f36d0da.png)
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解答题-证明题
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适中
(0.65)
真题
名校
【推荐2】如图,矩形
中,点
在边
上,将
沿
折叠,点
落在
边上的点
处,过点
作
交
于点
,连接
.
(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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fcee43665396e005b1432ced5a0fef4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b52a0c261c4749e34c7272c120b8288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
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解答题-证明题
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解题方法
【推荐1】如图1,正方形ABCD中,点E是边BC延长线上一点,连接DE,过点B作BF⊥DE,垂足为点F,BF与CD相交于点G.
(1)求证:△BCG≌△DCE;
(2)如图2,连接BD,若BE=4
,DG=2
,求tan∠DBG的值.
(1)求证:△BCG≌△DCE;
(2)如图2,连接BD,若BE=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/fb5c4fbe-5979-483f-a451-034e8525956c.png?resizew=351)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在正方形
中,点
是
上任意一点,连接
,作
于点
,
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727857229635584/2779551193456640/STEM/c818fd0fa8a34cfeb8141baa99a1b901.png?resizew=140)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/2021/5/24/2727857229635584/2779551193456640/STEM/c818fd0fa8a34cfeb8141baa99a1b901.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4361caa108e833114390d96058f9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次