如图, 在
中,
,点
分别在
边上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/0ea07fcb-4e48-4033-8f74-16b1dfcbcb9c.png?resizew=114)
(1)求证:
是等腰三角形;
(2)当
时, 求
的度数;
(3)若
,判断
是何种三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0e08a39c6619123557148d195abfbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/0ea07fcb-4e48-4033-8f74-16b1dfcbcb9c.png?resizew=114)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28331ca4051cf57b90b369180c93263.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7473dd5386b2dddef239a8554ff1d3eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28331ca4051cf57b90b369180c93263.png)
22-23八年级上·浙江杭州·期中 查看更多[2]
更新时间:2022-11-07 14:33:21
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相似题推荐
解答题-计算题
|
适中
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【推荐1】(1)计算:
.
(2)如图,在
中,
,将
绕点C按逆时针方向旋转一定角度得到
.若点
恰好落在AB边上,且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d28505a19ea8bb52696dbe1382859a.png)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489444614ac8db21e850a90da91ca299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b185184dc2dc3894a0313fd13f26a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18dc10da9c5253f0f2c495d0355eb12c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0003f478e764beabd8209943e483afe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/37cc5735-bf62-494d-aeef-6bbd7bbebc00.png?resizew=230)
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解答题-证明题
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名校
【推荐2】如图,在
中,
,
是
的平分线,
,交
于点E,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/6da16d19-b593-40b9-bfd3-0a5fa08b9960.png?resizew=172)
(1)求证:
是等腰三角形;
(2)求
和
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c8f23d81586bda1475c268d0a8d1e23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/6da16d19-b593-40b9-bfd3-0a5fa08b9960.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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解答题-证明题
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【推荐1】如图,在
中,
,点D是直线
上一点(不与B,C重合),以
为一边在
的右侧作
,使
,
,连接
.
(1)如图1,当点D在线段
上时,如果
,
①求证:
;
②直接写出
的度数;
(2)设
,
.
①如图2,当点D在线段
上移动时,
,
之间有怎样的数量关系?请说明理由;
②当点D在直线
上移动时,
,
之间有怎样的数量关系?请你在备用图上画出图形,并直接写出结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43651721f6c0ea4cf50a33054ecc5d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/46ff4c1e-b73a-4a5a-84c1-648f05bf6138.png?resizew=570)
(1)如图1,当点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49dca0cc635668c549ec80c1d893ed4.png)
①如图2,当点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
②当点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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解答题-证明题
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【推荐2】△ABC是等边三角形,点D是射线BC上的一个动点(点D不与点B、C重合),△ADE是以AD为边的等边三角形,过点E作BC的平行线,分别交射线AB、AC于点F、G,连接BE.
(1)如图(a)所示,当点D在线段BC上时.
①求证:△AEB≌△ADC;
②探究四边形BCGE是怎样特殊的四边形?并说明理由;
(2)如图(b)所示,当点D在BC的延长线上时,直接写出(1)中的两个结论是否成立;
(3)在(2)的情况下,当点D运动到什么位置时,四边形BCGE是菱形?并说明理由.
(1)如图(a)所示,当点D在线段BC上时.
①求证:△AEB≌△ADC;
②探究四边形BCGE是怎样特殊的四边形?并说明理由;
(2)如图(b)所示,当点D在BC的延长线上时,直接写出(1)中的两个结论是否成立;
(3)在(2)的情况下,当点D运动到什么位置时,四边形BCGE是菱形?并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/06782b62-8a36-4ccc-ace6-15d78e06abb6.png?resizew=387)
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解答题-证明题
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【推荐1】如图,在△ABC中,AC=BC,∠ACB=90°,延长CA至点D,延长CB至点E,使AD=BE,连接AE,BD,交点为O.
(1)求证:OB=OA;
(2)连接OC,若AC=OC,则∠D的度数是 度.
(1)求证:OB=OA;
(2)连接OC,若AC=OC,则∠D的度数是 度.
![](https://img.xkw.com/dksih/QBM/2021/2/23/2664376279973888/2671423319531520/STEM/13459069-1b26-44dc-9b15-9c68e1d10cae.png)
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解答题-证明题
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解题方法
【推荐2】已知,
中,
,点D在
边上,E在
的外部,连接
、
、
,且
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/8/2889836349661184/2890643707445248/STEM/bbcb628c-6deb-41a7-abef-d6e433771799.png?resizew=443)
(1)如图1,求证:
;
(2)如图2,当
时,连接
交
于点F,如果把顶角为
的等腰三角形称为黄金三角形,在不添加任何辅助线的情况下,请直接写出图2中四个黄金三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2889836349661184/2890643707445248/STEM/bbcb628c-6deb-41a7-abef-d6e433771799.png?resizew=443)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e4603c50b53888f3efea388a76fe64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b398c95494eddc79939f16e66cf4da.png)
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解答题-作图题
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适中
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【推荐1】【提出问题】如图①,已知直线l与⊙O相离,在⊙O上找一点M,使点M到直线l的距离最短.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898451414130688/2916480816513024/STEM/d7106354-6ea8-4768-8ec3-a158ba764188.png?resizew=401)
(1)小明给出下列解答,请你补全小明的解答.
小明的解答
过点O作ON⊥l,垂足为N,ON与⊙O的交点M即为所求,此时线段MN最短.
理由:不妨在⊙O上另外任取一点P,过点P作PQ⊥l,垂足为Q,连接OP,OQ.
∵OP+PQ>OQ,OQ>ON,
∴ .
又ON=OM+MN;
∴OP+PQ>OM+MN.
又 ,
∴ .
(2)【操作实践】如图②,已知直线l和直线外一点A,线段MN的长度为1.请用直尺和圆规作出满足条件的某一个⊙O,使⊙O经过点A,且⊙O上的点到直线l的距离的最小值为1.(不写作法,保留作图痕迹并用水笔加黑描粗)
(3)【应用尝试】如图③,在Rt△ABC中,∠C=90,∠B=30,AB=8,⊙O经过点A,且⊙O上的点到直线BC的距离的最小值为2,距离最小值为2时所对应的⊙O上的点记为点P,若点P在△ABC的内部(不包括边界),则⊙O的半径r的取值范围是 .
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898451414130688/2916480816513024/STEM/d7106354-6ea8-4768-8ec3-a158ba764188.png?resizew=401)
(1)小明给出下列解答,请你补全小明的解答.
小明的解答
过点O作ON⊥l,垂足为N,ON与⊙O的交点M即为所求,此时线段MN最短.
理由:不妨在⊙O上另外任取一点P,过点P作PQ⊥l,垂足为Q,连接OP,OQ.
∵OP+PQ>OQ,OQ>ON,
∴ .
又ON=OM+MN;
∴OP+PQ>OM+MN.
又 ,
∴ .
(2)【操作实践】如图②,已知直线l和直线外一点A,线段MN的长度为1.请用直尺和圆规作出满足条件的某一个⊙O,使⊙O经过点A,且⊙O上的点到直线l的距离的最小值为1.(不写作法,保留作图痕迹并用水笔加黑描粗)
(3)【应用尝试】如图③,在Rt△ABC中,∠C=90,∠B=30,AB=8,⊙O经过点A,且⊙O上的点到直线BC的距离的最小值为2,距离最小值为2时所对应的⊙O上的点记为点P,若点P在△ABC的内部(不包括边界),则⊙O的半径r的取值范围是 .
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解答题-作图题
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【推荐2】如图,点A,B,C在⊙O上,且∠ABC=120°,请仅用无刻度的直尺,按照下列要求作图.(保留作图痕迹,不写作法)
(1)在图(1)中,AB>BC,作一个度数为30°的圆周角;
(2)在图(2)中,AB=BC,作一个顶点均在⊙O上的等边三角形.
(1)在图(1)中,AB>BC,作一个度数为30°的圆周角;
(2)在图(2)中,AB=BC,作一个顶点均在⊙O上的等边三角形.
![](https://img.xkw.com/dksih/QBM/2022/1/1/2884882115362816/2885878229442560/STEM/c9b36eb4-0041-4cf1-bcae-e142ab19184e.png?resizew=268)
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