在
中,点
为线段
上一动点,点
为射线
上一动点,连接
,
.
,当点
在线段
上时,
交于点
,点
为
中点.
①如图1,若
,求
的长度;
②如图2,点
为线段
上一点,连接
并延长交
的延长线于点
.若点
为
中点,
,求证:
.
(2)如图3,若
.当点
在线段
的延长线上时,连接
,将
沿
所在直线翻折至
所在平面内得到
,连接
,当
取得最小值时,
内存在点
,使得
,当
取得最小值时,请直接写出
的值.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d8c8d9e5ebcf7a6f6a5595e9be75c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba83afe4ade6624b283331a18bdf2ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9a9bc9aeef0af1125f49e1f93530ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d412b6548de7c823da6ce80af85418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efedaf020e72e4d08fe422421de67df6.png)
(2)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce40c4594ac8c1e09e47c5f7e6539c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366f51d41a3989f78882fb1358fa6119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f875d939c8040a5cf196f928955af546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce16a8493d8934ef0df0bbd27c929af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffe67d727255ec27cc49abcffea3f2c.png)
23-24九年级上·重庆沙坪坝·期末 查看更多[4]
重庆市沙坪坝区第一中学校2023-2024学年九年级上学期期末数学试题重庆市部分学校2023-2024学年九年级下学期阶段测试数学试题2024学年重庆市巴蜀中学校九年级下学期数学模拟试题(已下线)抢分秘籍11 几何图形中求线段,线段和,面积等最值问题(4题型)-备战2024年中考数学抢分秘籍(全国通用)
更新时间:2024-04-06 21:12:06
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相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】【问题背景】如图
,在
与
中,若
,
,
.求证:
;
【尝试运用】如图
,在
和
中,
,
,
,
,延长
交
于点
.求证:
为
的中点;
【拓展创新】如图
,在
中,
,
,
边上的高为
,点
是直线
上一动点,连接
、在直线
的右侧作等边
,连接
,则
的最小值
__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
【尝试运用】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28b13d2f1f9be9344c8d3dbfee09dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【拓展创新】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf479faa4cf148239ae5bc62bd3c20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/01232030-7170-4a78-bc84-c1d6a84df178.png?resizew=479)
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【推荐2】如图,已知
ABC中,AB=AC=12cm,BC=10cm,点D为AB的中点.如果点P在线段BC上以2cm/s的速度由点B向C点运动,同时,点Q在线段AC上由点A向C点以4cm/s的速度运动.
(1)若点P、Q两点分别从B、A两点同时出发,经过2秒后,
BPD与
CQP是否全等?请说明理由;
(2)若点P、Q两点分别从B、A两点同时出发,
CPQ的周长为16cm,设运动时间为t,问:是否存在某一时刻t,使得
CPQ是等腰三角形?如存在,请求出t的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)若点P、Q两点分别从B、A两点同时出发,经过2秒后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)若点P、Q两点分别从B、A两点同时出发,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/0e5d6772-bfb1-47d5-98c6-808eb3b6ef12.png?resizew=141)
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【推荐1】在
和
中,点D在
边上,
,
.
.
ⅰ)如图1,当
时,连接
,证明:
;
ⅱ)如图2,当
时,过点A作
的垂线,交
边于点F,若
,
,求线段
的长;
(2)如图3,已知
,作
的角平分线交
边于点H,若
,
,当
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b2c767972aa7c8ca26d50d33bc001b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
ⅰ)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e38a5db168994ab1d25e0f09102660aa.png)
ⅱ)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9620e97567191461f1a87aebb7b4f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbacaabd2a70b326b9e9132b0a8c038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】阅读与理解
如图1,在等边三角形
中,点
是
上一点,
于点
,
于点
,
于点
,则有
.
证明:作
于点
,则
.
,
,
,
.
.
四边形
是矩形.
,
,
.
,
.
是等边三角形,
.
.
……
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/988267de-ef23-411d-8ad9-62bd63b3d1ed.png?resizew=420)
(1)请按照上面的证明思路,完成该结论证明的剩余部分;
(2)如图2,将矩形
沿着
折叠,使点
与点
重合,点
落在
处,点
为折痕
上一点,过点
作
于
,
于
.若
,
,求
的长为___________.
(3)如图3,点
是
上一点,
,
于点
,
于点
,
,则
的长为___________.
如图1,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f4eb640505099730001c4cbe65c3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3777af76d499c7fac730c4a7a56df19.png)
证明:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990063d87847305661b4e58a8e8e8cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af54d6c752d5d08d88452915282393dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ec588d8680de68680e807527c5dc2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f4eb640505099730001c4cbe65c3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990063d87847305661b4e58a8e8e8cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab6791589058a5e5d4847e51ead8b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5908e4f076e26bfa1eccd5bbb0bea0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d9e105e85fdef18c8f356907147188a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240d1d8077a908ac39f16d38ea3cc5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af54d6c752d5d08d88452915282393dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c1615f33b7177a883dafa2dab9e1c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9240f94dfcb9fedc6b318f2dd8f8747a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4104eb9bb917161730ec9e3376d37f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa0b14bd1ff42f3a9b55180ee72023e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c33cfb8e370e2a5b4e7e4c6a37f28ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32b2e5051b10011af020f5d3b077398.png)
……
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/988267de-ef23-411d-8ad9-62bd63b3d1ed.png?resizew=420)
(1)请按照上面的证明思路,完成该结论证明的剩余部分;
(2)如图2,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69776a24b2bc20ff14931ace73f0f0ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b676dfde981c8baab99e65a6e1966c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d2f701f081a28036bb08f5eb18c09d.png)
(3)如图3,点
![](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/43a1d24aa9cda4818cb05088d3750869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bb8ab7c2b4e68bae55828bcf240d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df3f49493b1f7317cbe2e95e79338a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4d6b0eec9b38311148668b08f8ccda.png)
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【推荐1】对于平面直角坐标系
中的点P,给出如下定义:记点P到x轴的距离为
,到y轴的距离为
,若
,则称
为点P的最大距离;若
,则称
为点P的最大距离.例如:点
到x轴的距离为4,到y轴的距离为3,因为
,所以点P的最大距离为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/4640ad31-ea14-4911-9308-3d5d194adff6.png?resizew=231)
(1)①点
的最大距离为______;
②若点
的最大距离为3,则a的值为______;
③若点
的最大距离为2,则a的值为______;
(2)若点C在直线
上,且点C的最大距离为5,求点C的坐标;
(3)若
上存在 点M,使点M的最大距离为
,直接写出
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/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd5c83e128a9f220131e706f88c8492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3a564d818475ea8fb19e4900114394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56bead9cbdf0138244c54496c1dece64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e840fbe63d521744ffabaa7645c21fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/4640ad31-ea14-4911-9308-3d5d194adff6.png?resizew=231)
(1)①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d24b61a5d3caab69af7149fa36e55c.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04013591c1cbaccfcd8983a0beaf8bd1.png)
③若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04013591c1cbaccfcd8983a0beaf8bd1.png)
(2)若点C在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa82a15632a545ce2cc6dc998899807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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名校
【推荐2】在平面直角坐标系
中, 对于点
和图形
,给出如下定义:若图形
上存在点
,使点
绕点
顺时针旋转
后得到点
,称点
为点
关于图形
的“旋转点”.特别地,若点
与点
重合,则 点
也是点
关于图形
的 “旋转点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/89e25315-d292-4fdd-a25b-e21ee3ddfcaa.png?resizew=517)
如图 1 ,点
.
(1)在点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0f20652f2730500ddf7da391809028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
中, 是点
关于
轴的“旋转点”的是 ;
(2)若
上存在点
关于
轴的“旋转点”,求
的半径
的取值范围.
(3)如图 2 ,
的半径为
时, 已知点
, 以线段
为边在 x 轴上方作正方形
. 若正方形
上存在点
关于
的“旋转点”,直接写出符合题意的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af1c680bff5a56719a789518cfa80f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4c2f1774953f32d3a87b96909f806c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e362de94f395bbb617bbb59b7fc17f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb3b1655781cd314fb50b24b3ab58ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc44280b21e1d9e17d9e6e5aac16bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e362de94f395bbb617bbb59b7fc17f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc44280b21e1d9e17d9e6e5aac16bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51ab627cfa3d5690cc973421b086414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/89e25315-d292-4fdd-a25b-e21ee3ddfcaa.png?resizew=517)
如图 1 ,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bf1fea498d27277f3e28cbabc773fe.png)
(1)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0f20652f2730500ddf7da391809028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf303eacf7b4abfbf0125ada6f7cd1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b062a59a457cc2788df67757338a3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12654e73b28db67d8eb198265610d0d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc44280b21e1d9e17d9e6e5aac16bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(3)如图 2 ,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302c1dddd73080997b0bfbbc1e601ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bfdc96743723495e0842fa8ad013f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc44280b21e1d9e17d9e6e5aac16bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12654e73b28db67d8eb198265610d0d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9a2c02dd45bb37acf9e638c8180a41.png)
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【推荐3】阅读下面材料:
对于平面图形A,如果存在一个圆,使图形A上的任意一点到圆心的距离都不大于这个圆的半径,则称图形A被这个圆所覆盖.
对于平面图形A,如果存在两个或两个以上的圆,使图形A上的任意一点到其中某个圆的圆心的距离都不大于这个圆的半径,则称图形A被这些圆所覆盖.
例如:图1中①的三角形被一个圆覆盖,②中的四边形被两个圆所覆盖.
![](https://img.xkw.com/dksih/QBM/2017/10/23/1807819239489536/1831208869371904/STEM/61b05d61-e153-4dc7-882b-4f1a70ccacf9.png)
回答下列问题:
(1)边长为1 cm的正方形被一个半径为r的圆所覆盖,r的最小值是______ cm;
(2)边长为1 cm的等边三角形被一个半径为r的圆所覆盖,r的最小值是_____ cm;
(3)长为2 cm,宽为1 cm的矩形被两个半径均为r的圆所覆盖,r的最小值是_____ cm.这两个圆的圆心距是_____ cm..
对于平面图形A,如果存在一个圆,使图形A上的任意一点到圆心的距离都不大于这个圆的半径,则称图形A被这个圆所覆盖.
对于平面图形A,如果存在两个或两个以上的圆,使图形A上的任意一点到其中某个圆的圆心的距离都不大于这个圆的半径,则称图形A被这些圆所覆盖.
例如:图1中①的三角形被一个圆覆盖,②中的四边形被两个圆所覆盖.
![](https://img.xkw.com/dksih/QBM/2017/10/23/1807819239489536/1831208869371904/STEM/61b05d61-e153-4dc7-882b-4f1a70ccacf9.png)
回答下列问题:
(1)边长为1 cm的正方形被一个半径为r的圆所覆盖,r的最小值是______ cm;
(2)边长为1 cm的等边三角形被一个半径为r的圆所覆盖,r的最小值是_____ cm;
(3)长为2 cm,宽为1 cm的矩形被两个半径均为r的圆所覆盖,r的最小值是_____ cm.这两个圆的圆心距是_____ cm..
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【推荐1】如图,点A、B、C、D在⊙O上,AB=AC,BD⊥AC,垂足为E.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932384306036736/2961000209399808/STEM/cc189658d8a4481c80c33bd2cd67d6ae.png?resizew=139)
(1)求证:∠A=∠DOC;
(2)连接AO并延长交⊙O于点M,若DC=2,AB=4,求AM的长.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932384306036736/2961000209399808/STEM/cc189658d8a4481c80c33bd2cd67d6ae.png?resizew=139)
(1)求证:∠A=∠DOC;
(2)连接AO并延长交⊙O于点M,若DC=2,AB=4,求AM的长.
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解答题-作图题
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【推荐2】已知:∠MBN=90°,点A在射线BM上,点C在射线BN上,D在线段BA上,⊙O是△ACD的外接圆;
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915448983453696/2918195573153792/STEM/99a22d0b-3edc-4e2b-8306-02be7106805f.png?resizew=578)
(1)若⊙O与BN的另一个交点为E,如图1,当
,BD=1,AD=2时,求CE的长;
(2)如图2,当∠BCA=∠BDC时,判断BN与⊙O的位置关系,并说明理由;
(3)如图3,在BN上作出C点,使得∠ACD最大,并求当AD=2,
时,⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915448983453696/2918195573153792/STEM/99a22d0b-3edc-4e2b-8306-02be7106805f.png?resizew=578)
(1)若⊙O与BN的另一个交点为E,如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27718c7561d646d66db48e330332471c.png)
(2)如图2,当∠BCA=∠BDC时,判断BN与⊙O的位置关系,并说明理由;
(3)如图3,在BN上作出C点,使得∠ACD最大,并求当AD=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b868fb5ae1ec7c7aca384557137ab704.png)
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