(1)如图1,在
中,
,
,
.
与
、
两边分别相切于点E,F,圆心O恰好在
上,求
的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/3cfb0b89-eaf5-4197-be57-224ae2a9ee4a.png?resizew=166)
(2)已知某文创园区原有一块草坪(
区域)如图2所示,经测量:
,
,在M处建有一个亭子,满足
.现要在原基础上扩大面积重新规划为花卉展区,要求在
上找一点P,连接
并延长到点D,使得
,过点P分别作
于E,
于F.按设计要求,四边形
区域为游客观赏区,其余部分为花卉展区(
、
、
三部分总和).为了游客得到更好的体验,需要尽可能把花卉展区布置大一些,请问能否将花卉展区面积设计最大?若可以,请求出最大面积;若不可以,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/3cfb0b89-eaf5-4197-be57-224ae2a9ee4a.png?resizew=166)
(2)已知某文创园区原有一块草坪(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21de382f8bc3f51527a866701022a754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c99b3e4e4e3200e0e6aef0af2a0112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b686b84b7a2b8e2326dbb88af5e855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d603566c74b1d5de510a2e8f7859010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97136ba3d3ffd4c48a50d69ea502d707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e488c00f4ef96956e2a7a1fdbded624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe40405cd7bd60d69dd535d6da85c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/150fe3137f76a6f05d9148c7d8c1810e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/4c4d45ed-06c5-4b7a-bde5-e97393791eb8.png?resizew=150)
更新时间:2024-02-26 16:32:29
|
相似题推荐
解答题-问答题
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【推荐1】如图1,抛物线y=ax2﹣10ax+c经过△ABC的三个顶点,已知BC∥x轴,点A在x轴上,点C在y轴上,OA=
且AC=BC.
(1)求抛物线的解析式;
(2)如图2,将△AOC沿x轴对折得到△AOC1,再将△AOC1绕平面内某点旋转180°后得△A1O1C2(A,O,C1分别与点A1,O1,C2对应)使点A1,C2在抛物线上,求A1,C2的坐标.
(3)如图3,若Q为直线AB上一点,直接写出|QC﹣QD|的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7199d76b03b7a40edca0ad1ebd4223.png)
(1)求抛物线的解析式;
(2)如图2,将△AOC沿x轴对折得到△AOC1,再将△AOC1绕平面内某点旋转180°后得△A1O1C2(A,O,C1分别与点A1,O1,C2对应)使点A1,C2在抛物线上,求A1,C2的坐标.
(3)如图3,若Q为直线AB上一点,直接写出|QC﹣QD|的取值范围.
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675506767896576/1676755706003456/STEM/4490ddbde9b54220b36c0f3930341dae.png?resizew=550)
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【推荐2】卡塔尔世界杯期间,主办方向中国某企业订购1万幅边长为4米的正方形作品
,其设计图案如图所示(四周阴影是四个全等的矩形,用材料甲;中心区是正方形
,用材料乙).在厚度保持相同的情况下,两种材料的消耗成本如下表
设矩形的较短边
的长为x米,制作一幅作品的材料费用为y元.
(1)
的长为______米(用含x的代数式表示);
(2)求y关于x的函数解析式,并写出自变量x的取值范围;
(3)当中心区的边长不小于3时,预备材料的购买资金700万够用吗?通过运算,请写出你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae2fd0bb6dcb90ee752e7bcabd22b8e.png)
材料 | 甲 | 乙 |
价格(元/![]() | 60 | 30 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd61a751e4a47463b69923c771d085c4.png)
(2)求y关于x的函数解析式,并写出自变量x的取值范围;
(3)当中心区的边长不小于3时,预备材料的购买资金700万够用吗?通过运算,请写出你的理由.
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名校
【推荐3】如图1,抛物线y=
x2﹣
(m﹣1)x﹣
m(m>0)与x轴交于A、B两点(点A在点B的左侧),与y轴交于点C,且OB=3OA.
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061135504932864/2063361918140416/STEM/16c7f6cc6f7b4cbeac49a698f4d01f20.png?resizew=363)
(1)求该抛物线的函数表达式;
(2)动点D在线段BC下方的抛物线上.
①连接AC、BC,过点D作x轴的垂线,垂足为E,交BC于点F.过点F作FG⊥AC,垂足为G.设点D的横坐标为t,线段FG的长为d,用含t的代数式表示d;
②过点D作DH⊥BC,垂足为H,连接CD.是否存在点D,使得△CDH中的一个角恰好等于∠ABC的2倍?如果存在,求出点D的横坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061135504932864/2063361918140416/STEM/16c7f6cc6f7b4cbeac49a698f4d01f20.png?resizew=363)
(1)求该抛物线的函数表达式;
(2)动点D在线段BC下方的抛物线上.
①连接AC、BC,过点D作x轴的垂线,垂足为E,交BC于点F.过点F作FG⊥AC,垂足为G.设点D的横坐标为t,线段FG的长为d,用含t的代数式表示d;
②过点D作DH⊥BC,垂足为H,连接CD.是否存在点D,使得△CDH中的一个角恰好等于∠ABC的2倍?如果存在,求出点D的横坐标;如果不存在,请说明理由.
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名校
【推荐1】已知:
为
的直径,
为
的切线,连接
交
于点C.
;
(2)如图2,点E为
中点,点F为
上一点,连接
,若
,求
的度数;
(3)如图3,在(2)的条件下,点M、G为
上两点,连接
,且
,连
,若
,若
,
,求线段
的长度.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/4fc9f0c725bab48110a5c55dba6af2da.png)
(2)如图2,点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3c2424dbfc7dbc5d6d09edadd0a19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12556fec84c15880aca288be6ff133fc.png)
(3)如图3,在(2)的条件下,点M、G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69761baa081e73cb00e235db839f8131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b54446f3aa80a85220acb6b13f2ffb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b239e7cf9467e237fa6bd314fa5937d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb263e62622b80aa3c33a9ada6b62b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a96d1e67d5e74d6122c8dfa63f183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】如图
,
为
外接圆,点
、
分别为
、
中点,连结
、
、
,
分别与
、
交于点
、
.已知
.
.
(2)如图2,连结
交
于点
,连结
交
于点
,连结
、
.若
,求证:
是等边三角形.
(3)在(2)的基础上,若
,
①求DN的长;
②求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fc232acd89fc499de346969ce8ced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3722ce5a109be331b49a0c49484865.png)
(2)如图2,连结
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d795ab324fa876ed29440b5c672b9b1.png)
(3)在(2)的基础上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdec73fbada10c986b5b4996863a7bd.png)
①求DN的长;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dd5fd11452098a9dc0a27bcf8c3e6b.png)
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【推荐1】在平面直角坐标系
中,
的半径为r,P是与圆心C不重合的点,点P关于
的限距点的定义如下:若
为直线
与
的一个交点,满足
,则称
为点P关于
的限距点,如图1为点P及其关于
的限距点
的示意图.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/237719d4-7bb0-42b3-93c8-774aa10f39ea.png?resizew=372)
(1)当
的半径为
时.
①分别判断点
,
,
关于
的限距点是否存在?若存在,求其坐标;
②如图2,点D的坐标为
,DE,DF分别切
于点E,F,点P在
的边上.若点P关于
的限距点
存在,求点
的横坐标的取值范围.
(2)保持(1)中D,E,F三点不变,点P在
的边DE,DF上沿F→D→E的方向运动,
的圆心C的坐标为
,半径为r,若点P关于
的限距点
不存在,则r的取值范围为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe7b4b90d4b572fc4764aed833f4d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/237719d4-7bb0-42b3-93c8-774aa10f39ea.png?resizew=372)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
①分别判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc90eeed6ddf072938b72ec8ec76419c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc46f09a8c079e2916af98bb2f96f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac4e81d3406a435fb39b5ec3e5c5b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②如图2,点D的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a812a9b58ccba331cfd21d244329af01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
(2)保持(1)中D,E,F三点不变,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
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【推荐2】如图,点
是圆
直径
延长线上的一点,
与圆
相切于点
,点
是圆上的一点,连接
,
.
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661f4b08d8e19833d958a8435259949a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c94ff4614059e5e91ed304b150d886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c7e43b7115dcc3548a5dbdb423473b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解题方法
【推荐3】苏科版教材八年级下册第94页第19题,小明在学过圆之后,对该题进行重新探究,请你和他一起完成问题探究.
【问题探究】小明把原问题转化为动点问题,如图1,在边长为6cm的正方形ABCD中,点E从点A出发,沿边AD向点D运动,同时,点F从点B出发,沿边BA向点A运动,它们的运动速度都是2cm/s,当点E运动到点D时,两点同时停止运动,连接CF、BE交于点M,设点E, F运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896413049970688/2901394434506752/STEM/e920e03c-55f0-4c2d-930e-a3fe923f8087.png?resizew=369)
(1)【问题提出】如图1,点E,F分别在方形ABCD中的边AD、AB上,且
,连接BE、CF交于点M,求证:
.请你先帮小明加以证明.
(2)如图1,在点E、F的运动过程中,点M也随之运动,请直接写出点M的运动路径长 cm.
(3)如图2,连接CE,在点E、F的运动过程中.
①试说明点D在△CME的外接圆
O上;
②若①中的
O与正方形的各边共有6个交点,请直接写出t的取值范围.
【问题探究】小明把原问题转化为动点问题,如图1,在边长为6cm的正方形ABCD中,点E从点A出发,沿边AD向点D运动,同时,点F从点B出发,沿边BA向点A运动,它们的运动速度都是2cm/s,当点E运动到点D时,两点同时停止运动,连接CF、BE交于点M,设点E, F运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896413049970688/2901394434506752/STEM/e920e03c-55f0-4c2d-930e-a3fe923f8087.png?resizew=369)
(1)【问题提出】如图1,点E,F分别在方形ABCD中的边AD、AB上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8290323a3da9d76a509ba5d14daabe97.png)
(2)如图1,在点E、F的运动过程中,点M也随之运动,请直接写出点M的运动路径长 cm.
(3)如图2,连接CE,在点E、F的运动过程中.
①试说明点D在△CME的外接圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091e86ca89e484b331fd90125a5e5af3.png)
②若①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091e86ca89e484b331fd90125a5e5af3.png)
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