如图,点D在线段
上,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/9496418e-5b90-4bf7-8a37-4dcfabf3b6cb.png?resizew=134)
(1)尺规作图:作
的平分线,交
于点F(要求:保留作图痕迹,不写作法);
(2)在(1)的基础上证明:
.
证明:∵
,
∴
______,
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ea1792227a613af4e41bb1babb614b.png)
∴
,
∴______![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba00448a7a8f056d18789f6f72b7128.png)
∵______,
∴
(“三线合一”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/9496418e-5b90-4bf7-8a37-4dcfabf3b6cb.png?resizew=134)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)在(1)的基础上证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ea1792227a613af4e41bb1babb614b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f56c2f30371f8c2b1baca72553ca384.png)
∴______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba00448a7a8f056d18789f6f72b7128.png)
∵______,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
更新时间:2023-03-28 12:51:47
|
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解答题-证明题
|
适中
(0.65)
真题
【推荐1】将△ABC绕点B逆时针旋转α得到△DBE,DE的延长线与AC相交于点F,连接DA、BF.
(1)如图1,若∠ABC=α=60°,BF=AF.
![](https://img.xkw.com/dksih/QBM/2013/9/17/1573685528985600/1573685535383552/STEM/5e170652-b8b8-4d8f-8066-7a59fc26bbde.png?resizew=219)
①求证:
;②猜想线段DF、AF的数量关系,并证明你的猜想;
(2)如图2,若∠ABC<α,BF=mAF(m为常数),求
的值(用含m、α的式子表示).
(1)如图1,若∠ABC=α=60°,BF=AF.
![](https://img.xkw.com/dksih/QBM/2013/9/17/1573685528985600/1573685535383552/STEM/5e170652-b8b8-4d8f-8066-7a59fc26bbde.png?resizew=219)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca69d3a1138a324e626a41e11cc0a69.png)
(2)如图2,若∠ABC<α,BF=mAF(m为常数),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9a9917e36391c5141f22ca6b5fed5f.png)
![](https://img.xkw.com/dksih/QBM/2013/9/17/1573685528985600/1573685535383552/STEM/30e88c55-e205-4aa1-adb7-fb9d0e5aab77.png?resizew=184)
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解答题-问答题
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适中
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【推荐2】当图形具有邻边相等的特征时,我们可以把图形的一部分绕着公共端点旋转,这样将分散的条件集中起来,从而达到解决问题的目的.
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864326553780224/2865859338371072/STEM/1e047114-acbd-4ecf-9097-eab971520155.png?resizew=367)
(1)如图1,等腰直角三角形ABC内有一点P,连接AP,BP,CP,∠APB=135°,为探究AP,BP,CP三条线段间的数量关系,我们可以将△ABP,绕点A逆时针旋转90°得到△ACP',连接PP',则PP'= AP,△CPP'是 三角形,AP,BP,CP三条线段的数量关系是 .
(2)如图2,等边三角形ABC内有一点P,连接AP、BP、CP,∠APB=150°,请借助第一问的方法探究AP、BP、CP三条线段间的数量关系.
(3)如图3,在四边形ABCD中,AD∥BC,点P在四边形的内部,且PD=PC,∠CPD=90°,∠APB=135°,AD=4,BC=5,请直接写出AB的长.
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864326553780224/2865859338371072/STEM/1e047114-acbd-4ecf-9097-eab971520155.png?resizew=367)
(1)如图1,等腰直角三角形ABC内有一点P,连接AP,BP,CP,∠APB=135°,为探究AP,BP,CP三条线段间的数量关系,我们可以将△ABP,绕点A逆时针旋转90°得到△ACP',连接PP',则PP'= AP,△CPP'是 三角形,AP,BP,CP三条线段的数量关系是 .
(2)如图2,等边三角形ABC内有一点P,连接AP、BP、CP,∠APB=150°,请借助第一问的方法探究AP、BP、CP三条线段间的数量关系.
(3)如图3,在四边形ABCD中,AD∥BC,点P在四边形的内部,且PD=PC,∠CPD=90°,∠APB=135°,AD=4,BC=5,请直接写出AB的长.
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解答题-作图题
|
适中
(0.65)
【推荐1】已知:如图,
,点
在
上,
.
(1)求作线段
的垂直平分线,交
于点
;
(2)联结
,求作
的角平分线
;
(3)根据(1)(2)的条件,求
的长.
(第(1)、(2)题保留作图痕迹,不需要写出作图步骤)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6b253b7f7aa120fa6dd980bfc5fabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434845564fd5765244f8d1aa9240fa39.png)
(1)求作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171a4fabac4cb1650225cc9f99909144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)根据(1)(2)的条件,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(第(1)、(2)题保留作图痕迹,不需要写出作图步骤)
![](https://img.xkw.com/dksih/QBM/2021/3/16/2679269697003520/2682656020029440/STEM/40c85bf409874fcd8dd3ae0bdcae9121.png?resizew=166)
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解答题-作图题
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适中
(0.65)
名校
【推荐2】如图,Rt△ABC中,∠C=90°.
(1)在斜边AB上确定一点E,使点E到点B距离和点E到AC的距离相等;(要求:尺规作图,不写作法,保留作图痕迹)
(2)在(1)的条件下,若BC=6,点E到AC的距离为ED=4,求BD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/c436ff1c-f967-49a6-8e86-1af4675d0b35.png?resizew=150)
(1)在斜边AB上确定一点E,使点E到点B距离和点E到AC的距离相等;(要求:尺规作图,不写作法,保留作图痕迹)
(2)在(1)的条件下,若BC=6,点E到AC的距离为ED=4,求BD的长.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,等腰直角
中,
.
(1)如图1所示,若D是
内一点,将线段
绕点C顺时针旋转
得到
,连接
,
,猜想线段
与
的关系并说明理由;
(2)如图2所示,若D是
外一点,将线段
绕点C顺时针旋转
得到
,且
,求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/64fe88c5-aa09-489e-9db2-f07da4b84317.png?resizew=284)
(1)如图1所示,若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2所示,若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e7bdd33ad2697cfb58d12fc41afdd8.png)
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名校
【推荐2】已知
是
的直径,C为
上一点,连接
,过点O作
于D,交弧
于点E,连接
,交
于F.
(1)如图1,求证:
.
(2)如图2,连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7251d14111473460f02a65c7531c51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/6df73e6e-f6d9-45ed-a66f-e434f798bae5.jpg?resizew=313)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877bda8e7700dc36fc02bf27a1770365.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcf9cd1b1e0bd2f24e8520cd267d9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次