如图所示,在街道
的同一侧,有两个居民区A,B,两个居民区门口到街道的距离分别为AC,BD.现准备在街道
旁设置一个快递中转站.
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945685540864/2510189023690752/STEM/2f9d4232586649999306cc7e3b37cf3a.png?resizew=206)
(1)如果设置的快递中转站到A,B两个小区的距离相等,如图1,当∠A=∠BPD时,请说明AC+BD=CD的理由;
(2)如果设置的快递中转站到A,B两个小区的距离之和最短,请在图2中作出点P的位置,连接AP,BP,直接写出此时∠PAC与∠PBD的数量关系;
(3)为了能错峰进行取送快递,决定设置的快递中转站到A,B两个小区的距离之差最大,请在图3中作出点P的位置,连接AP,BP,直接写出此时∠PAC与∠PBD的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945685540864/2510189023690752/STEM/78ae95e3a7804880b7d0f8796f558b0f.png?resizew=208)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945685540864/2510189023690752/STEM/8262b1158e464c3e87cfdd99676a018f.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945685540864/2510189023690752/STEM/2f9d4232586649999306cc7e3b37cf3a.png?resizew=206)
(1)如果设置的快递中转站到A,B两个小区的距离相等,如图1,当∠A=∠BPD时,请说明AC+BD=CD的理由;
(2)如果设置的快递中转站到A,B两个小区的距离之和最短,请在图2中作出点P的位置,连接AP,BP,直接写出此时∠PAC与∠PBD的数量关系;
(3)为了能错峰进行取送快递,决定设置的快递中转站到A,B两个小区的距离之差最大,请在图3中作出点P的位置,连接AP,BP,直接写出此时∠PAC与∠PBD的数量关系.
19-20七年级下·重庆南岸·期末 查看更多[2]
更新时间:2020-07-20 22:15:33
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图 ,在小河河岸的同侧,一牧民在A点处放马,现在要到河边去给马饮水,然后再回到点B处.问在何处饮水才能使牧民所走的路程最短?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/ddddd950-2c8a-4db3-9d44-05801cd48b6d.png?resizew=201)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,
的三个顶点的坐标分别为
,
,
.
的坐标;
(2)画出
关于y轴对称的
,并写出点B的对应点
的坐标;
(3)在x轴上求作一点P,使点P到A、B两点的距离和最小,请标出点P.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6419152065edb8cabf887b65adb4a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7089a4e568ed92b1230af589f4d47be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
(3)在x轴上求作一点P,使点P到A、B两点的距离和最小,请标出点P.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】证明命题“全等三角形的面积相等”,要根据题意,画出图形,并用符号表示已知和求证,写出证明过程.下面是小明同学根据题意画出的图形,并写出了不完整的已知和求证.
![](https://img.xkw.com/dksih/QBM/2022/2/28/2926316968738816/2928090536927232/STEM/a5b3c690-cbc6-4927-823c-c1795c9e8372.png?resizew=295)
已知:如图, .
求证: .
请你补全已知和求证,并写出证明过程.
![](https://img.xkw.com/dksih/QBM/2022/2/28/2926316968738816/2928090536927232/STEM/a5b3c690-cbc6-4927-823c-c1795c9e8372.png?resizew=295)
已知:如图, .
求证: .
请你补全已知和求证,并写出证明过程.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在△ABC中,∠ABC=60°,⊙O是△ABC的外接圆,过点A作⊙O的切线,交CO的延长线于点M,CM交⊙O于点D.
![](https://img.xkw.com/dksih/QBM/2020/11/15/2593213974405120/2593720462893056/STEM/9851ba0e95584d2ab48d927e4c163624.png?resizew=195)
(1)求证:AM=AC;
(2)填空:
①若AC=6,MC=________;
②连接BM,当∠AMB的度数为________时,四边形AMBC是菱形.
![](https://img.xkw.com/dksih/QBM/2020/11/15/2593213974405120/2593720462893056/STEM/9851ba0e95584d2ab48d927e4c163624.png?resizew=195)
(1)求证:AM=AC;
(2)填空:
①若AC=6,MC=________;
②连接BM,当∠AMB的度数为________时,四边形AMBC是菱形.
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
中,
,
,点D在边
上运动(点D不与B、C重合),连接
,作
,
交边
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/b5a8f9b6-c13a-4909-9418-257332729639.png?resizew=152)
(1)当
时,
______°;
(2)若
,求证:
;
(3)在点D的运动过程中,当
是等腰三角形时,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38103c8bd5ccfd79b84c8cc9811f225.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/53c7e6ed72af3bd9e9393c9fc6df24bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/b5a8f9b6-c13a-4909-9418-257332729639.png?resizew=152)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc2ed067420a68283827093ac7281ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4ea2f99b7326d71004ef9bd4f39d61.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abaf30f9b5dba2fc7e55f0fbf1079c60.png)
(3)在点D的运动过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b47abcacc10f90489c0d52a9e269ab.png)
您最近一年使用:0次