有两张完全重合的矩形纸片,将其中一张绕点A顺时针旋转90°后得到矩形
(如图1),连接
,
,若
,
.
(1)线段
与线段
的关系是 .
(2)把
与
剪去,将
绕点A顺时针旋转得
,边
交
于点K(如图2),设旋转角为β(
),当
为等腰三角形时.
①求β的度数;
②求
的面积(保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a6f856872cd504d322ae27919ef2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4039eb47de7f6e3ab9cbf148b5c0ffcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5120dc734849e35eded0eed3db4329c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/9bee39ab-948a-4899-8e75-a2a8c349a860.png?resizew=302)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
(2)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891b72156544758442245afbaa566c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee9556b322965c1ee5731ea37220df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb73d71d7941459e9a56212eca0aff5.png)
①求β的度数;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb73d71d7941459e9a56212eca0aff5.png)
更新时间:2023-12-10 20:27:29
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在菱形
中,
,
,点
从点
出发,沿线段
以
的速度向终点
运动,过点
作
于点
,作
交直线
于点
,交直线
于点
,设
与菱形
重叠部分图形的面积为
,点
的运动时间为
.
(1)当点
与点
重合时,
的值为________;
(2)当
与
全等时,直接写出
的值;
(3)求
关于
的函数解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4bb197a337102cb0d9007e473177a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ddd25759f63f954bb1e0e6b94fda1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d603566c74b1d5de510a2e8f7859010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5845d0b7ca6980eea65473c0de995de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2f212d21a0737013033f80f4fdd947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e5e85ad05975afe26f514dbd760c30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/c7d50a6a-eb47-4ccb-ac85-90b19e22b2e3.png?resizew=162)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图1,在边长为4cm的等边△ABC中,点P从点A出发沿着AB以2cm/s的速度向点B运动,点Q从B点出发沿着BC以相同的速度向点C运动,P、Q两点同时出发,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/339f7bd2-9eb6-4db5-a8e1-06d9a48c27a9.png?resizew=318)
(1)当t=1时,试判断△PBQ的形状,并说明理由;
(2)当PQ⊥BC时,求t的值;
(3)如图2,过点P作PH⊥BC,垂足为H,连接PQ,以PQ为边向左作等边△PQE,连接BE.
①用含t的代数式表示QH的长;
②当0≤t≤
时,BE的长度能否为2cm?若能,求出此时QH的长;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/339f7bd2-9eb6-4db5-a8e1-06d9a48c27a9.png?resizew=318)
(1)当t=1时,试判断△PBQ的形状,并说明理由;
(2)当PQ⊥BC时,求t的值;
(3)如图2,过点P作PH⊥BC,垂足为H,连接PQ,以PQ为边向左作等边△PQE,连接BE.
①用含t的代数式表示QH的长;
②当0≤t≤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8b45edad1f59a7454739675fd2de55.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,
中,
,点D在
所在的直线上,点E在射线
上,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/61e1a2a6-425b-4984-8208-0da53ff25bbf.png?resizew=526)
(1)如图①,
,
,求
的度数.
(2)如图②,若
,
,求
的度数.
(3)当点D在直线
上运动时(不与点B、C重合),试探究
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77c8ef75793d21d2d5d8bf470a61159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4f137168291e38b45977c3369d7bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/61e1a2a6-425b-4984-8208-0da53ff25bbf.png?resizew=526)
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953b43ca677099ae805859ae622f98ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff66a9adaacdaf0ada9fcf8e3876d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea030e8898e4c41cbb269ccf4ec318a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfc7d56563b035c123744c94f147275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(3)当点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】在
中,
,
,点D为射线
上一动点,连接
,在
右侧作线段
,使
,且满足
,连接
,
,
(1)如图1,若点D在线段
的延长线上,求证:
;
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140487169851392/3142079379529728/STEM/4c81a332be124eacb4db25004ff44397.png?resizew=202)
(2)如图2,若点D在线段
上,取
的中点F,连接
,
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140487169851392/3142079379529728/STEM/c49ba5cb229a4622b9e381ba0253919b.png?resizew=194)
①依题意补全图2,
②用等式表示线段
与
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eba7e2cb2e2390673b83bde332973d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(1)如图1,若点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b934165dc7df8492efe78d1ddc923ed.png)
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140487169851392/3142079379529728/STEM/4c81a332be124eacb4db25004ff44397.png?resizew=202)
(2)如图2,若点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140487169851392/3142079379529728/STEM/c49ba5cb229a4622b9e381ba0253919b.png?resizew=194)
①依题意补全图2,
②用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在等边
中,
,
,现有
,
两点分别从点
,
同时出发,沿
的边运动,已知点
的速度为
,点
的速度为
,当点
第一次到达
点时,
,
同时停止运动,设运动时间为
.
(1)当
为何值时,
,
两点重合?两点重合在什么位置?
(2)当点
,
在
边上运动时,是否存在使
的位置?若存在,请求出此时点
,
运动的时间;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbec75945564ba93ddebba782247bac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b768530dc812e6642bd852f0f50cbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f9a9781bcf32e907bdd3170261648a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af169e1a6c6c59af61c9d01f1d1dd26.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/5216cd20-34a6-41e1-9338-655ec088a299.png?resizew=211)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐2】如图,在Rt△ABC中,∠C=90°,BC=4cm,AC=8cm,点P从点A出发,沿AC方向以2cm/s的速度向终点C运动,PD⊥AC,PD=PA,点F在射线AC上,FP=2PA,以PD、PF为邻边构造矩形PDEF,设点P的运动时间为t(s).
(1)AF= (用含t的代数式表示).
(2)当点B落在DE上时,求t的值.
(3)连接BF,△ABF是等腰三角形时,求t的值.
(4)当点E在△ABC的边的垂直平分线上时,直接写出t的值.
(1)AF= (用含t的代数式表示).
(2)当点B落在DE上时,求t的值.
(3)连接BF,△ABF是等腰三角形时,求t的值.
(4)当点E在△ABC的边的垂直平分线上时,直接写出t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/03c87793-6b20-4a18-bfd3-9d0abba3a056.png?resizew=390)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】已知:如图,在Rt△ABC中,∠C=90°,AC=3cm,BC=4cm,点P从点B出发,沿BC向点C匀速运动,速度为lcm/s;同时,点Q从点A出发,沿AB向点B匀速运动,速度为2cm/s;当一个点停止运动时,另一个点也停止运动连接PQ,设运动时间为t(s)(0<t<2.5),解答下列问题:
(1)①BQ= ,BP= ;(用含t的代数式表示)
②设△PBQ的面积为y(cm2),试确定y与t的函数关系式;
(2)在运动过程中,是否存在某一时刻t,使△PBQ的面积为△ABC面积的二分之一?如果存在,求出t的值;不存在,请说明理由;
(3)在运动过程中,是否存在某一时刻t,使△BPQ为等腰三角形?如果存在,求出t的值;不存在,请说明理由.
(1)①BQ= ,BP= ;(用含t的代数式表示)
②设△PBQ的面积为y(cm2),试确定y与t的函数关系式;
(2)在运动过程中,是否存在某一时刻t,使△PBQ的面积为△ABC面积的二分之一?如果存在,求出t的值;不存在,请说明理由;
(3)在运动过程中,是否存在某一时刻t,使△BPQ为等腰三角形?如果存在,求出t的值;不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/3/16/2161581309509632/2163386210820096/STEM/1adb3262b3a14482bad57819e5078742.png?resizew=174)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】综合与实践综合与实践课上,老师与同学们以“特殊的三角形”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/3d740e5e-879b-4cd1-b627-15aa5053c75a.png?resizew=389)
(1)操作判断:如图1,在
中,
,点P是直线
上一动点.操作一:连接
,将线段
绕点P逆时针旋转
得到
,连接
,如图2.根据以上操作,判断:如图3,当点P与点A重合时,则四边形
的形状是 ;
(2)迁移探究:①如图4,当点P与点C重合时,连接
,判断四边形
的形状,并说明理由;
②当点P与点A,点C都不重合时,试猜想
与
的位置关系,并利用图2证明你的猜想;
(3)拓展应用:当点P与点A,点C都不重合时,若
,请直接写出
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/3d740e5e-879b-4cd1-b627-15aa5053c75a.png?resizew=389)
(1)操作判断:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5a3613c6274a75ea742c271956ff608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(2)迁移探究:①如图4,当点P与点C重合时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c3f982d999937891eec4cb22d62e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f54af2fca6a5d8bc36e8b489e8cbc8.png)
②当点P与点A,点C都不重合时,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(3)拓展应用:当点P与点A,点C都不重合时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79787041b70aab506a2ca6ee2cd8d0ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】在△ABC和△ADE中,AC=BC,AE=DE,且AE<AC,∠ACB=∠AED=90°,将△ADE绕点A顺时针方向旋转,把点E在AC边上时△ADE的位置作为起始位置(此时点B和点D位于AC的两侧),设旋转角为α,连接BD,点P是线段BD的中点,连接PC,PE.
(1)如图1,当△ADE在起始位置时,猜想:PC与PE的数量关系和位置关系,并说明理由;
(2)如图2,当
时,点D落在AB边上,请判断PC与PE的数量关系和位置关系,并证明你的结论;
(3)当α=150°时,若BC=3,DE=1,请直接写出PC2的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/8ec73d46-d286-4384-bab3-bdd1a2f3ebc2.png?resizew=511)
(1)如图1,当△ADE在起始位置时,猜想:PC与PE的数量关系和位置关系,并说明理由;
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
(3)当α=150°时,若BC=3,DE=1,请直接写出PC2的值.
您最近一年使用:0次