在矩形
中,
,
,点
是边
上一点,
交
于点
,点
在射线
上,且
是
和
的比例中项.
;
(2)如图2,当点
在线段
之间,连接
,且
与
互相垂直,求
的长;
(3)连接
,如果
与以点
、
、
为顶点所组成的三角形相似,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15588e7682a4a9ffd2f1c65f1b2997de.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c16646c5300db1194cef128a76a3689.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](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/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2024-05-22 15:45:52
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】已知,点
是矩形
内一点,
如图①,过点
作
,垂足为点
,延长
交
于点
, 求证:四边形
是矩形;
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466151126728704/2467241859080192/STEM/80608e4b00124df291b49d772ad539b5.png?resizew=206)
如图②,已知
,则
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c7ad328a7683a80cd357d6b10fb761.png)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466151126728704/2467241859080192/STEM/80608e4b00124df291b49d772ad539b5.png?resizew=206)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750ba8b0efefdd983aba44ed5dce7394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466151126728704/2467241859080192/STEM/bae66d41c8c546c290fd6daa60c0444d.png?resizew=197)
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【推荐2】如图,在矩形
中,
,
,点E为
的中点,延长
到点M,使得
,点P从点M出发,以每秒1个单位长度的速度向点C运动,设运动时间为t秒.连接
,过点E作
(点F在
右侧),且
.
的边上.
(2)在点P运动过程中,点F到直线
的距离是否为定值,若是,请求出该值;若不是,请说明理由.
(3)连接
,作点E关于
的对称点
,当点
恰好落在矩形
的边上时,求t的值.
(4)连接
,请直接写出在点P运动过程中
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e34f3fbb1adf23cf81d7005f4387a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c36867457cd8183db6fb50a18021a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44085623d98e9917d9818ec9343561a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76f3bdf9ffde18a98d986da024dde0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(2)在点P运动过程中,点F到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e71d05d494d0fdb954b6faec6cd17e6.png)
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【推荐1】问题情境:在综合实践课上,同学们以“正方形的旋转”为主题开展活动.如图①,四边形
和四边形
都是正方形,边长分别是12和13,将顶点A与顶点E重合,正方形
绕点A逆时针方向旋转,连接
.
初步探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/3bc368ed-33f8-4fe7-bc2b-36cb769d7f21.jpg?resizew=340)
(1)试猜想线段
与
的关系,并加以证明;
(2)如图②,在正方形
的旋转过程中,当点F恰好落在
边上时,连接
,求线段
的长;
(3)在图②中,若
与
交于点M,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e75a376b04057da422d3f85dc4f03a.png)
初步探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/3bc368ed-33f8-4fe7-bc2b-36cb769d7f21.jpg?resizew=340)
(1)试猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(2)如图②,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(3)在图②中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
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解答题-证明题
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【推荐2】如图,在△ABC中,AC=BC,∠ACB=120°,D是AB中点,一个以点D为顶点的60°角绕点D旋转,使角的两边分别与AC、BC的延长线相交,交点分别为点E,F,DF与AC交于点M,DE与BC交于点N.
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228098428035072/2230624165249024/STEM/05fce17f65d44121bf156e310df96681.png?resizew=364)
(1)如图1,若CE=CF,求证:DE=DF;
(2)如图2,在∠EDF绕点D旋转的过程中:
①探究三条线段AC,CE,CF之间的数量关系,并说明理由;
②若CE=9,CF=4,求CN的长.
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228098428035072/2230624165249024/STEM/05fce17f65d44121bf156e310df96681.png?resizew=364)
(1)如图1,若CE=CF,求证:DE=DF;
(2)如图2,在∠EDF绕点D旋转的过程中:
①探究三条线段AC,CE,CF之间的数量关系,并说明理由;
②若CE=9,CF=4,求CN的长.
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解答题-证明题
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较难
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【推荐1】如图,△ABC内接于⊙O,直径AD交BC于点E,延长AD至点F,使DF=2OD,连接FC并延长交过点A的切线于点G,且满足AG∥BC,连接OC,若cos∠BAC=
,BC=6.
![](https://img.xkw.com/dksih/QBM/2020/1/17/2378842598080512/2379931245707264/STEM/4c28374e2dc14847a167342f9974a928.png?resizew=210)
(1)求证:∠COD=∠BAC;
(2)求⊙O的半径OC;
(3)求证:CF是⊙O的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2020/1/17/2378842598080512/2379931245707264/STEM/4c28374e2dc14847a167342f9974a928.png?resizew=210)
(1)求证:∠COD=∠BAC;
(2)求⊙O的半径OC;
(3)求证:CF是⊙O的切线.
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解答题-问答题
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较难
(0.4)
名校
【推荐2】对于平面直角坐标系
中的点P和
,给出如下的定义:若
上存在两个点
、
,使得
,则称P为
的关联点.已知点
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/9fb23bf5-3483-4e94-992f-0ee86e9ac483.png?resizew=182)
(1)当
的半径为1时,
①在点
、
、
中,
的关联点是________.
②过点F作直线l交y轴正半轴于点G,使
,若直线l上点
是
的关联点,请直接写出m的取值范围;
(2)若线段
上的所有点都是某个圆的关联点,请直接写出这个圆的半径r的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a80d835ad6f210d253af50fa7ef4443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da4aaaaf4687d9c61b25fa505ecb4e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a309b11e84fbbbb8ecac901daf33c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/9fb23bf5-3483-4e94-992f-0ee86e9ac483.png?resizew=182)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
①在点
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②过点F作直线l交y轴正半轴于点G,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61cd05f38b1a6b77224751e3608619c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21872d8f6a518e0a2993ccf7a795ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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