如图
,是以点
为圆心,
为直径的圆形纸片,点
在
上,将该圆形纸片沿直径
对折,点
落在
上的点
处
不与点
重合
,将纸片还原后,连接
,
,
设
与直径
交于点
.
![](https://img.xkw.com/dksih/QBM/2022/12/29/3141519222046720/3161153286217728/STEM/ecba623c81fb43a2b507950d84d4d94b.png?resizew=530)
(1)求证:
;
(2)如图
,当
时,若
,求
的长;
(3)如图
,当
时,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7678c489a9bcd8f97567adcef55a9269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/12/29/3141519222046720/3161153286217728/STEM/ecba623c81fb43a2b507950d84d4d94b.png?resizew=530)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9204fa555e4c2945323c6c49116ccfa4.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63ab71efa010821650ffe08bd907f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bdcc2742be52cc80ba7dbe79f9a574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
更新时间:2023-01-26 15:25:44
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
是
的直径,D是
上一点,连接
,C为
延长线上一点,连接
,且
.
是
的切线;
(2)判定:
是否与
相似,并说明理由;
(3)若
的半径为2,
,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/7bbc34514ed62e90c5f23307aa7b1593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2462e31acf29ac2a6c77c6ba6339041d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)判定:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf94bbdc11e2942b20368833c7d7a787.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2395720e6d6aeb7efdcd8e921849acf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,以
的边
为直径作
,交
于
点,交
于
点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/4f93f6fd-a5b7-4bf8-8854-6eef8d6b6f95.png?resizew=136)
(1)求证:
是等腰三角形;
(2)若
是
的中点,
的半径为2,连接
,求阴影部分的面积(结果保留
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/4f93f6fd-a5b7-4bf8-8854-6eef8d6b6f95.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图将一张长方形纸片,分别沿着
对折,使点B落在点
,点C落在
.
![](https://img.xkw.com/dksih/QBM/2022/11/6/3103699806339072/3105324720332800/STEM/1da8b9444820494cb8b96aa482d20f7e.png?resizew=501)
(1)若点
在同一直线上(如图1),求
的度数;
(2)若点
不在同一直线上(如图2),且重叠部分
,求
;
(3)若点
不在同一直线上(如图3),
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5ae3e092fc19a17392d506af32246c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://img.xkw.com/dksih/QBM/2022/11/6/3103699806339072/3105324720332800/STEM/1da8b9444820494cb8b96aa482d20f7e.png?resizew=501)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/528ef12394645916805eef5b2e4504ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/528ef12394645916805eef5b2e4504ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf2b63d09d9995d9761fe5ebd59707f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/528ef12394645916805eef5b2e4504ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf2b63d09d9995d9761fe5ebd59707f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】折叠长方形纸片ABCD(四个内角都是直角)的一边AD,使点D落在BC边的点F处,已知AB=8cm,BC=10cm,
![](https://img.xkw.com/dksih/QBM/2012/2/21/1573341165953024/1573341185212416/STEM/cc37c6ff57b1404882c3d841105ab642.png?resizew=181)
(1)求BF的长;
(2)求EF的长;
![](https://img.xkw.com/dksih/QBM/2012/2/21/1573341165953024/1573341185212416/STEM/cc37c6ff57b1404882c3d841105ab642.png?resizew=181)
(1)求BF的长;
(2)求EF的长;
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在矩形ABCD中,AB=15
,BC=10
,点P沿AB边从点A开始向B点以
的速度移动,点Q沿DA边从点D开始向点A以
的速度移动.若P、 Q同时出发,用t(秒)表示移动时间.
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/3c89608cfeb1416ba9e4fa9af87bc2e7.png)
(1)问:当t=5时,求Δ
的面积是多少?
(2)当t为何值时,Δ
为等腰直角三角形?
(3)当t为何值时,以点P、A、Q为顶点的 Δ
与Δ
相似?
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/03fed559f408465cbc90921e0a6bd56c.png)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/03fed559f408465cbc90921e0a6bd56c.png)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/817034e8017b476487239f52aabe1ffd.png)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/7db303031b7a4e6c9dece768cbb06603.png)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/3c89608cfeb1416ba9e4fa9af87bc2e7.png)
(1)问:当t=5时,求Δ
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/9ffef2d2b3f340c395b481477a46cba9.png)
(2)当t为何值时,Δ
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/9ffef2d2b3f340c395b481477a46cba9.png)
(3)当t为何值时,以点P、A、Q为顶点的 Δ
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/9ffef2d2b3f340c395b481477a46cba9.png)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1578560252624896/1578560253198336/STEM/78728fa316b349e283e23ccb183638dd.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】【模型建立】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/68670e31-1d5c-41d0-a501-04980e8a6a69.png?resizew=442)
(1)如图①,点
为
的边
上一点,连接
,
,若
,
,则
的长为______;
【类比探究】
(2)如图②,在菱形
中,
为对角线,
、
分别为
、
边上的点,连接
、
,
,延长
交
的延长线于点
,试探究
、
、
之间的数量关系,并说明理由;
【问题解决】
(3)如图③,菱形
是王叔叔家一块花园的平面示意图,对角线
是一条赏花通道,王叔叔准备在边
、
上分别取点
、
,连接
并延长,交
的延长线于点
,连接
并延长,交
的延长线于点
,并在
和
内种植单价为
元
平方米的太阳花,根据王叔叔的规划:
,且种植太阳花的总资金不超过
元,已知
区域种满后花费了
元,经测量,
,请你通过计算说明,将
区域种满该种太阳花后,资金是否够用?并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/68670e31-1d5c-41d0-a501-04980e8a6a69.png?resizew=442)
(1)如图①,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【类比探究】
(2)如图②,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf7b8304e69448c4a4130e6bec538cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
【问题解决】
(3)如图③,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/2a30f3a8b673cc28bd90c50cf1a35281.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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f381da95a07d7f8322f5b1e1d0cb55ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf7b8304e69448c4a4130e6bec538cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1926eb08a21a8b6558fcfd4c52a4a23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f381da95a07d7f8322f5b1e1d0cb55ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abb59695562b3a1295a251dc97da700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c581c14d682e983ff00c8a23650b47ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
您最近一年使用:0次