已知在平面直角坐标系中,
的两个顶点
、
分别在
轴和
轴的正半轴上,且
,
.将
绕点
顺时针方向旋转得
.
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179421464117248/2179506488483840/STEM/1b4c02b976894385be89119bc1af4c9c.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179421464117248/2179506488483840/STEM/c00377ec508e478a8eb4acc1c2ecded5.png?resizew=197)
(Ⅰ)如图1所示,若旋转过程中,
点的对应点(点
)恰好落在斜边
上时,求点
的坐标;
(Ⅱ)在(Ⅰ)的条件下,连接
.点
、
同时从点
出发,在
边上运动,点
以每秒
个单位的速度沿
路径匀速运动,点
以每秒1个单位的速度沿
路径匀速运动,当两点相遇时运动停止.
①设运动过程中点
的坐标为
,写出
与
的关系式,并写出自变量
的取值范围;
②设运动的时间为
秒,设
的面积为
,求当
为何值时
取得最大值?最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf33aa3d1fbed7a3ba2983f1ed27451.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b449b1b22749f6efd914f26b1f71ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf33aa3d1fbed7a3ba2983f1ed27451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbced129627233661d88e9663a9e13c0.png)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179421464117248/2179506488483840/STEM/1b4c02b976894385be89119bc1af4c9c.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179421464117248/2179506488483840/STEM/c00377ec508e478a8eb4acc1c2ecded5.png?resizew=197)
(Ⅰ)如图1所示,若旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)在(Ⅰ)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4309cc517da10cf325b0003e50d8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cc6293cfedec30b124ece908c4c438.png)
①设运动过程中点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②设运动的时间为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
更新时间:2019-04-10 17:20:12
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,
.
(1)连接
,求
的长;
(2)若
是边
上一点,过点
,
,
作
.
①当
取最小值时,求
的长;
②若
与
交于点
,当
与
的某条边垂直时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/98f1ac08-9c33-4243-a76c-e6e1b672a8d8.png?resizew=210)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/3d97cdc586744d208b6f69c9813af977.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14f419e14bc30fe2fada469a0fbbb64.png)
②若
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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名校
【推荐2】如图,点F是正方形ABCD边AB上一点,过F作FG∥BC,交CD于G,连接FC,H是FC的中点,过H作EH⊥FC交BD于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/bc1fbc87-83c4-4455-aada-602aaf744a93.png?resizew=173)
(1)连接EF,EA,求证:EF=AE.
(2)若
,
①若CD=2,
,求HE的长;
②连接CE,求tan∠DCE的值.(用含k的代数式表示)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/bc1fbc87-83c4-4455-aada-602aaf744a93.png?resizew=173)
(1)连接EF,EA,求证:EF=AE.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd282530e45bb5d34c705858c7f7c86.png)
①若CD=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9a5fbf690581d8517d264c254a1f72.png)
②连接CE,求tan∠DCE的值.(用含k的代数式表示)
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解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】综合与探究
如图,抛物线
经过点
,
,与
轴交于另一点
(点
在点
的右侧),点
是第四象限内抛物线上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6afd286f-a186-445d-9539-35a2caf4b09d.png?resizew=111)
(1)求抛物线的函数解析式及点
的坐标;
(2)若
的面积为
,请直接写出
关于
的函数关系表达式,并求出当
的值为多少时,
的值最大?最大值为多少?
(3)是否存在点
,使得
?若存在,求出点
的坐标;若不存在,请说明理由.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50a15e67fdb7a31db934cf11341894b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6afd286f-a186-445d-9539-35a2caf4b09d.png?resizew=111)
(1)求抛物线的函数解析式及点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bdf79ad54602f30fe55e96b93bcff24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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较难
(0.4)
【推荐2】已知开口向下的抛物线y=ax2﹣2ax+3与x轴的交点为A、B两点(点A在点B的左边),与y轴的交点为C,OC=3OA
(1)请直接写出该抛物线解析式;
(2)如图,D为抛物线的顶点,连接BD、BC,P为对称轴右侧抛物线上一点.若∠ABD=∠BCP,求点P的坐标
(3)在(2)的条件下,M、N是抛物线上的动点.若∠MPN=90°,直线MN必过一定点,请求出该定点的坐标.
(1)请直接写出该抛物线解析式;
(2)如图,D为抛物线的顶点,连接BD、BC,P为对称轴右侧抛物线上一点.若∠ABD=∠BCP,求点P的坐标
(3)在(2)的条件下,M、N是抛物线上的动点.若∠MPN=90°,直线MN必过一定点,请求出该定点的坐标.
![](https://img.xkw.com/dksih/QBM/2019/6/12/2223851899265024/2225288661401600/STEM/fe72888592bc42fb8729d66294c93f38.png?resizew=433)
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较难
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【推荐3】如图①,四边形OABC是矩形,点A的坐标为(3,0),点C的坐标为(0,6),点P从点O出发,沿线段OA以每秒1个单位长度的速度向点A移动,同时点Q从点A出发,沿线段AB以每秒2个单位长度的速度向点B移动,当点P与点A重合时移动停止.设点P移动的时间为t秒.
(1)当△CBQ与△PAQ相似时,求t的值;
(2)当t=1时,抛物线y=x2+bx+c经过P,Q两点,与y轴交于点M,抛物线的顶点为K,如图②所示,该抛物线上是否存在点D,使∠MQD=
∠MKQ?若存在,请求出所有满足条件的点D的坐标;若不存在,请说明理由.
(1)当△CBQ与△PAQ相似时,求t的值;
(2)当t=1时,抛物线y=x2+bx+c经过P,Q两点,与y轴交于点M,抛物线的顶点为K,如图②所示,该抛物线上是否存在点D,使∠MQD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/3bee4280-8d2f-4cb8-a8e9-023acf09980b.png?resizew=353)
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较难
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【推荐1】如图1,以矩形
的顶点
为原点,
所在直线为
轴,
所在直线为
轴,建立平面直角坐标系,顶点为点
的抛物线
经过点
,点
.
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247356879912960/2247503327002624/STEM/0609af32136b4c5d904c53fee3bf641d.png?resizew=347)
(1)写出抛物线的对称轴及点
的坐标,
(2)将矩形
绕点
顺时针旋转
得到矩形
.
①当点
恰好落在
的延长线上时,如图2,求点
的坐标.
②在旋转过程中,直线
与直线
分别与抛物线的对称轴相交于点
,点
.若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d1595826d7875d71138b9297710c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247356879912960/2247503327002624/STEM/0609af32136b4c5d904c53fee3bf641d.png?resizew=347)
(1)写出抛物线的对称轴及点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
②在旋转过程中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fce10478485ef01d2318fc3465bb4e.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/a5bba25a314fb799efba2895cb1f1f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解答题-作图题
|
较难
(0.4)
【推荐2】如图,
是等腰
内一点,
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082736182460416/3120062835089408/STEM/0ec1e854cb384bc99fc77116e5b6bd4f.png?resizew=323)
(1)如图1,当
时,将
绕
点顺时针旋转
,画出旋转后的图形;
(2)在(1)中,若
,
,
,求
的大小;
(3)当
时,且
,
,
,则
的面积是 (直接填答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082736182460416/3120062835089408/STEM/0ec1e854cb384bc99fc77116e5b6bd4f.png?resizew=323)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
(2)在(1)中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b887d1ee136ff6a805c1b2a9158ac207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
名校
解题方法
【推荐3】如图1,已知正方形BEFG,点C在BE的延长线上,点A在GB的延长线上,且AB=BC,过点C作AB的平行线,过点A作BC的平行线,两条平行线相交于点D.
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973769552969728/2977667397910528/STEM/9790304a288747c997c2ced07b52dd27.png?resizew=434)
(1)证明:四边形ABCD是正方形;
(2)当正方形BEFG绕点B顺时针(或逆时针)旋转一定角度,得到图2,使得点G在射线DB上,连接BD和DF,点Q是线段DF的中点,连接CQ和QE,猜想线段CQ和线段QE的关系,并说明理由;
(3)将正方形BEFG绕点B旋转一周时,当∠CGB等于45°时,直线AE交CG于点H,探究线段CH、EG、AH的长度关系.
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973769552969728/2977667397910528/STEM/9790304a288747c997c2ced07b52dd27.png?resizew=434)
(1)证明:四边形ABCD是正方形;
(2)当正方形BEFG绕点B顺时针(或逆时针)旋转一定角度,得到图2,使得点G在射线DB上,连接BD和DF,点Q是线段DF的中点,连接CQ和QE,猜想线段CQ和线段QE的关系,并说明理由;
(3)将正方形BEFG绕点B旋转一周时,当∠CGB等于45°时,直线AE交CG于点H,探究线段CH、EG、AH的长度关系.
您最近一年使用:0次