已知,
中,D是
上的一点,且
,过点D作
交
于点E,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/e46cdfb0-30f2-4dbd-b546-21875e1f4cb2.png?resizew=211)
(1)求证:
;
(2)若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf16b9529102652f061bd162c8ec1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0532fccfa9bae5ed1b954b9f4a2c94d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f7d9f5e71bfef8188b1216c1276c2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/e46cdfb0-30f2-4dbd-b546-21875e1f4cb2.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9c67e2727f18443b5cf81ccca24892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
2015·北京海淀·二模 查看更多[3]
2015届北京市海淀区中考二模数学试卷(已下线)第23章 解直角三角形(单元卷02)-2018-2019学年九年级上学期数学教材(沪科版)山东省济南市商河县实验中学2022-2023学年九年级下学期第一次月考数学试题
更新时间:2016-12-06 01:04:56
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
,
是
的弦,
平分
.过点
作
的切线交
的延长线于点
,连接
,
.延长
交
于点
,交
于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/d718eae9-6892-455e-bb59-d34337d06a81.png?resizew=216)
(1)求证:
是
的切线;
(2)若
,求
的长.
![](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/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/d718eae9-6892-455e-bb59-d34337d06a81.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad9318bcbc75c31743fe9e6578f785a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在
中,
,
,过点
作
,
恰好是
的平分线,求证:
(1)
.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6719e1a16b40b975da49c69391095c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/2e9eec00-d81b-49c1-9b91-9b985f3e574c.png?resizew=164)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
中,
,垂足为
,
,
,
.
(1)求证:
;
(2)在
边上找一点P,连接
,若
是以
为腰的等腰三角形,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/d1c5fe2b-4f7c-4637-a3a8-d5f4b6ccd0f9.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图
中
,
平分
平分
,过D作直线平行于
,交
于E,F.
,求
的度数;
(2)若
,求证:点D是
的中点;
(3)求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0b09ffa80b037291ee8b58c03b1e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc8d03b28e9e9a7175b6c9d70ffea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90171e9a969c4e06495d9fcdcceba199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】△ABC和△AED都是等腰直角三角形,∠BAC=∠EAD=90°.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727827362971648/2730669602775040/STEM/ee2236fbd68e4a16b767f0283796c5a1.png?resizew=144)
(1)如图①,点B在线段AE上,点C在线段AD上,请直接写出线段BE与线段CD的数量关系: ;
(2)如图②,将图①中的△ABC绕点A顺时针旋转,旋转角为α(0°<α<360°),请判断并证明线段BE与线段CD的数量关系;
(3)将图①中的△ABC绕点A顺时针旋转,旋转角为α(0°<α<360°),若DE=2AC,在旋转的过程中,当以A、B、C、D四点为顶点的四边形是平行四边形时,请直接写出旋转角α的度数.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727827362971648/2730669602775040/STEM/243fbd3bdc854bf78f132398308ac92b.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727827362971648/2730669602775040/STEM/24879386bf3c4a82a4e47f1441f9d3b8.png?resizew=130)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727827362971648/2730669602775040/STEM/ee2236fbd68e4a16b767f0283796c5a1.png?resizew=144)
(1)如图①,点B在线段AE上,点C在线段AD上,请直接写出线段BE与线段CD的数量关系: ;
(2)如图②,将图①中的△ABC绕点A顺时针旋转,旋转角为α(0°<α<360°),请判断并证明线段BE与线段CD的数量关系;
(3)将图①中的△ABC绕点A顺时针旋转,旋转角为α(0°<α<360°),若DE=2AC,在旋转的过程中,当以A、B、C、D四点为顶点的四边形是平行四边形时,请直接写出旋转角α的度数.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在正方形
中,点E为
边上一点.
边上画一点F,使得
恰是
的平分线(保留作图痕迹,不写作法);
(2)在(1)的条件下,若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7c8630dc73828eec20b778072909fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e219b4b74587a077f223fec499bace9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79dd1b99a422eebcf5ce1568a84aae33.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】已知:把Rt△ABC和Rt△DEF按如图1摆放(点C与点E重合),点B、C(E)、F在同一条直线上,∠ACB=∠EDF=90°,∠DEF=45°,AC=8cm,BC=6cm,EF=9cm,如图2,△DEF从图1的位置出发,以1cm/s的速度沿CB向△ABC匀速移动,在△DEF移动的同时,点P从△ABC的顶点B出发,以2cm/s的速度沿BA向点A匀速移动.当△DEF的顶点D移动到AC边上时,△DEF停止移动,点P也随之停止移动.DE与AC相交于点Q,连接PQ,设移动时间为t(s)(0<t<4.5).解答下列问题:
(1)用含t的代数式表示线段AP= ;
(2)当t为何值时,点E在∠A的平分线上?
(3)当t为何值时,点A在线段PQ的垂直平分线上?
(4)连接PE,当t=1(s)时,求四边形APEC的面积.
(1)用含t的代数式表示线段AP= ;
(2)当t为何值时,点E在∠A的平分线上?
(3)当t为何值时,点A在线段PQ的垂直平分线上?
(4)连接PE,当t=1(s)时,求四边形APEC的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/23/084dcc66-be4e-4697-9aaa-32de64c32982.png?resizew=450)
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