【问题背景】已知D、E分别是
的
边和
边上的点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ceeb5e5ad5cd7e520e231d523709ca.png)
,把
绕着点A逆时针方向旋转,连接
和
.如图2,找出图中的另外一组相似三角形__________;并加以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/89eeaef8-a217-4f6e-b3e8-cbf2422930c4.png?resizew=225)
【迁移应用】如图3,在
中,
,
,
,D、E、M分别是
、
、
中点,连接
.
①如图4,把
绕着点A逆时针方向旋转,在旋转过程中直接写出线段CE和BD始终存在的位置关系和数量关系:__________、__________;
②把
绕着点A逆时针方向旋转到如图5所在的位置,连接
和
,取
中点N,连接
,若
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/615d825b-80dd-4dda-917b-41c088c423a8.png?resizew=313)
【创新应用】如图6:
,
,
是直角三角形,
,将
绕着点A旋转,连接
,F是
上一点,
,连接
,请直接写出
的取值范围.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ceeb5e5ad5cd7e520e231d523709ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/89eeaef8-a217-4f6e-b3e8-cbf2422930c4.png?resizew=225)
【迁移应用】如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cfebeceba5791f21e3b9fac7b4be681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eccb33ea66c03222468628f74d8c56.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
①如图4,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d110261e49b946b3e859ad0a8ba48a09.png)
②把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d110261e49b946b3e859ad0a8ba48a09.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df003447e98fd5ba9badd42177f345db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/615d825b-80dd-4dda-917b-41c088c423a8.png?resizew=313)
【创新应用】如图6:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59276a28786bdce15453a4676c7314d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c50d6d16f99c65005dfb950c30d760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17745e4b357acf175cca995340b065e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/cbe90f81-2770-4858-86be-be4fa576feff.png?resizew=320)
更新时间:2024-01-10 12:15:29
|
相似题推荐
解答题-证明题
|
困难
(0.15)
【推荐1】如图,在
中,
,
,
绕点A逆时针旋转
至
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/aec32c8a-00bd-47e9-a762-156120ef7356.jpg?resizew=448)
(1)如图1,
______
;
(2)如图2,
,过点C作
交
于点E,求证∶
;
(3)如图3,
平分
,交
于点N,
于点M,
,则
_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fcb71ca75ec0ca0b5bf21a73296e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/aec32c8a-00bd-47e9-a762-156120ef7356.jpg?resizew=448)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf16b9529102652f061bd162c8ec1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6d946ec5bc75341f7e5fe400054464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ab924e3692515bd8be4c36472a959a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeda1190f24899bb85ba081127f9d8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】在矩形
中,
,点E是边
的中点,点P是对角线
上一动点,连接
,作点A关于直线
的对称点的
;
(1)若点P是
的中点,求
的长度.
(2)若
是以
为腰的等腰三角形,求
的长度;
(3)直线
交
于点Q,连接
,若
是直角三角形,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd1dadbfb93f5581c04a45a9ed2668b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/b8612b05-14ec-44c6-8260-d15d87660bd3.png?resizew=570)
(1)若点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9837eb5ae9180b64dadfbd2fdfb9da8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
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解答题-问答题
|
困难
(0.15)
【推荐3】如图,在△ABC中,∠ACB=90°,AC=12,BC=9,点D为边AB的中点.点P从点A出发,沿AC方向以每秒1个单位的速度向终点C运动;同时点Q从点C出发,以每秒2个单位的速度沿CB方向运动,以DP、DQ为邻边构造平行四边形PEQD.设点P运动的时间为t秒,
.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2963123523878912/2964548354113536/STEM/cebea92a-cfae-41e9-a022-118137215a02.png?resizew=315)
(1)求当t为何值时,
?
(2)设平行四边形PEQD的面积为S(
),求S关于t之间的函数关系式;
(3)连接CD,是否存在某一时刻t,CD经过平行四边形PEQD的对称中心O?若存在,求出t的值;若不存在,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6135db787a88f139878db388865ca9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/21/2963123523878912/2964548354113536/STEM/cebea92a-cfae-41e9-a022-118137215a02.png?resizew=315)
(1)求当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4c4bc3804f6de8121526deb752457d.png)
(2)设平行四边形PEQD的面积为S(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe8fabd6b7f3547c18062c8781dbd45.png)
(3)连接CD,是否存在某一时刻t,CD经过平行四边形PEQD的对称中心O?若存在,求出t的值;若不存在,请说明理由;
您最近一年使用:0次
【推荐1】如图(1),已知矩形
中,
,点E为对角线
上的动点.连接
,过E作
的垂线交
于点F.
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782306651430912/2782376685273088/STEM/808b5497-e6ea-4433-b814-7ddab332b9c3.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782306651430912/2782376685273088/STEM/893ec7c1-4c7b-4e9f-8879-d3e06d99f142.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782306651430912/2782376685273088/STEM/20687935-678d-40ec-8c8f-a445daf3822a.png)
(1)探索
与
的数量关系,并说明理由.
(2)如图(2),过F作
垂线交
于点G,交
于点H,连接
.若点E从A出发沿
方向以
的速度向终点C运动,设E的运动时间为
.
①是否存在t,使得H与B重合?若存在,求出t的值;若不存在,说明理由;
②t为何值时,
是等腰三角形;
③当
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67907274ae8080b792072a48727fa377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782306651430912/2782376685273088/STEM/808b5497-e6ea-4433-b814-7ddab332b9c3.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782306651430912/2782376685273088/STEM/893ec7c1-4c7b-4e9f-8879-d3e06d99f142.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782306651430912/2782376685273088/STEM/20687935-678d-40ec-8c8f-a445daf3822a.png)
(1)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图(2),过F作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b817e8e7e79c83de6741384ec843afe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
①是否存在t,使得H与B重合?若存在,求出t的值;若不存在,说明理由;
②t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beec023ec3ee72d98f728fd79374968.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9ddaa7097afa02e91d4de2cb50718e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bde5e96c203f387b2004b4abf5f839f.png)
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解答题-问答题
|
困难
(0.15)
【推荐2】如图,已知直线y=﹣x+3的图象分别交x轴于A点,交y轴于B点,抛物线y=﹣x2+bx+c经过点A、B两点,并与x轴交于另一点D,顶点为C.
(1)求C、D两点的坐标;
(2)求tan∠BAC;
(3)在y轴上是否存在一点P,使得以P、B、D三点为顶点的三角形与△ABC相似?如果存在,请求出点P的坐标;如果不存在,请说明理由.
(1)求C、D两点的坐标;
(2)求tan∠BAC;
(3)在y轴上是否存在一点P,使得以P、B、D三点为顶点的三角形与△ABC相似?如果存在,请求出点P的坐标;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/5/11/1684398314381312/1737329202675712/STEM/d76949e2170e476a9cb4b12c511593e4.png?resizew=112)
您最近一年使用:0次