【概念呈现】在钝角三角形中,钝角的度数恰好是其中一个锐角的度数与90度的和,则称这个钝角三角形为和美三角形,这个锐角叫做和美角.
【概念理解】(1)当和美三角形是等腰三角形时,求和美角的度数.
【性质探究】(2)如图1,
是和美三角形,
是钝角,
是和美角,
求证:
.
【拓展应用】(3)如图2,
是
的直径,且
,点C,D是圆上的两点,弦
与
交于点E,连接
,
,
是和美三角形.
①当
时,求
的长.
②当
是和美三角形时,直接写出
的值.
【概念理解】(1)当和美三角形是等腰三角形时,求和美角的度数.
【性质探究】(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcab95fe4c5763054ab3d15ec8aa9ad8.png)
【拓展应用】(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a205a7eab74e544c9e5635f1ef9e9702.png)
2024·浙江台州·一模 查看更多[2]
更新时间:2024-03-25 22:20:02
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相似题推荐
解答题-证明题
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困难
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【推荐1】如图1、已知A、B、D在
上,
经过点O且与
垂直垂足为点H,点F是线段
上的一个动点(不与H,B重合),连接
并延长与
交于点C,过点C作
的切线
交
的延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ee132300-c910-4df7-9f52-972f64636f7e.png?resizew=418)
(1)求证:
;
(2)如图2,连接
,已知
,当
时,求证:
;
(3)在(2)的条件下,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14f6100d829f197a5dac5197bbe0b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ee132300-c910-4df7-9f52-972f64636f7e.png?resizew=418)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00334461f72c07c50e1d46679eb98378.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3870daad135599475d9eae68632c005d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa18c2a78c400c80a5760743f31771c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcd2b4a3912db651f82c805c1423d7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86dbf2fe9883863efdb53f0ccb19a711.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e31113242dd22d9bd046174625211b.png)
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【推荐2】在
与
中,
,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/22/2877951681470464/2928486502678528/STEM/21b7899b-0cde-48fc-8d52-d47867f85646.png?resizew=592)
(1)如图1,若点D与A重合,且
,
,求EF的长;
(2)如图2,若点D与C重合,EF与BC交于点M,且
,连接AE,且
,求证:
;
(3)如图3,若点D与A重合,连接BE,且
,连接BF,CE,当
最小时,直接写出
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65633001f2eecfee015749ffb6fa4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://img.xkw.com/dksih/QBM/2021/12/22/2877951681470464/2928486502678528/STEM/21b7899b-0cde-48fc-8d52-d47867f85646.png?resizew=592)
(1)如图1,若点D与A重合,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9817d6eaf6f9454152b2891f33aaa760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acee288e75061ac72203b09fce29904.png)
(2)如图2,若点D与C重合,EF与BC交于点M,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0435f724a67b42436680115721cc3f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e744f04521924943186a441397ee7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad181665edc6960d4daec3849bce38a.png)
(3)如图3,若点D与A重合,连接BE,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c11ddc8ae69717640df7f033cbb9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f4d53985a03be1279af3cc6c5f6e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2e18c8b2abf0a666ca5dca11a9af0c.png)
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【推荐1】如图,
是
的直径,
是
的弦,
交
于点
,连接
,过点
作
,垂足为
,
.
![](https://img.xkw.com/dksih/QBM/2020/8/7/2522794546782208/2522825228918784/STEM/70ef083fb49b4ea6b2e94c136f35421b.png?resizew=261)
(1)求证:
;
(2)点
在
的延长线上,连接
.
①求证:
与
相切;
②当
时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a828edad1e9c2af9fd56748bba0326b.png)
![](https://img.xkw.com/dksih/QBM/2020/8/7/2522794546782208/2522825228918784/STEM/70ef083fb49b4ea6b2e94c136f35421b.png?resizew=261)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370de9898dcfdab95400f22ddaca8126.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0d2c4243112f107834f412e2a20a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐2】如图1,平面直角坐标系中,点
为坐标原点,直线
与
轴交于点
,与
轴交于点
,过点
作直线
,交
轴于点
,且线段
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/339d3786-fe85-456d-8406-92a471cf0640.png?resizew=378)
(1)求直线
的解析式;
(2)如图2,点
是线段
上一点,点
在
的延长线上,连接
,
,若
,求证:
;
(3)如图3,在(2)的条件下,点
为第四象限内一点,且点
的横坐标小于点
的横坐标,连接
,
,且
,连接
交
轴于点
,使
.点
为第二象限内一点,连接
交
轴于点
,交
轴于点
,连接
,使
,若
,
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9bd144e0e96e4236a14523e0729cacb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/339d3786-fe85-456d-8406-92a471cf0640.png?resizew=378)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f306ba11b8632c1ca25bccf19f321bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7494f0bae9d1671048287d8389a9135b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/312c446a4790d75afde82f81e0e217ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d0a6c5c9b36c912a9e2efbe2eff86bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d07484c93ff29bd799784c12e9c4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a205080843a1a87556403ede8960dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐1】例题再现:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/dd130d54-50bc-4774-8cd6-552ccab4834f.png?resizew=461)
(1)如图1,在
中,
,
,
,E是
上一点,
,
,垂足为D,求
的长;
类比探究:
(2)如图2,在
中,
,
,点D,E分别在线段
,
上,连接
,
,在
上截取
,连接
,
.求
的长;
拓展延伸:
(3)如图3,在
中,点D,点E分别在线段
,
上,连接
,
.延长
,
交于点F,过点B作
于点M,
,
,
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/dd130d54-50bc-4774-8cd6-552ccab4834f.png?resizew=461)
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc5df62e8ac9c74a46462519b95479a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8daff96303a07819bd4ee47731e73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
类比探究:
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6133decf8382f19fcccce11b1e74b238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcca6da184ef596a45135f9e48fce83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42b24348ad7354744eecd1e122db679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
拓展延伸:
(3)如图3,在
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcca6da184ef596a45135f9e48fce83d.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/77ec052adffafe74e7903b37a7e483a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-问答题
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困难
(0.15)
解题方法
【推荐2】问题提出:
(1)如图①,矩形ABCD中,AD=6.点E为AD的中点.点F在AB上,过点E作EG
AB交FC于点G.若EG=7.则S△EFC= .
问题探究:
(2)如图②.已知矩形ABCD纸片中.AB=9,AD=6,点P是CD边上一动点.点Q是BC的中点.将△ADP沿着AP折叠,在纸片上点D的对应点是
,将△QCP沿着PQ折叠.在纸片上点C的对应点是
.请问是否存在这样的点P.使得点P、
、
在同一条直线上?若存在,求出此时DP的长度.若不存在,请说明理由.
问题解决:
(3)某精密仪器厂接到生产一种特殊四边形金属部件的任务.部件要求:如图③,四边形ABCD中,AB=4厘米,点C到AB的距离为5厘米,BC⊥CD.且BC=
CD.在满足要求和保证质量的前提下,仪器厂希望造价最低,已知这种金属材料每平方厘米造价50元.请问这种四边形金属部件每个的造价最低是多少元?(
≈1.73)
(1)如图①,矩形ABCD中,AD=6.点E为AD的中点.点F在AB上,过点E作EG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
问题探究:
(2)如图②.已知矩形ABCD纸片中.AB=9,AD=6,点P是CD边上一动点.点Q是BC的中点.将△ADP沿着AP折叠,在纸片上点D的对应点是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
问题解决:
(3)某精密仪器厂接到生产一种特殊四边形金属部件的任务.部件要求:如图③,四边形ABCD中,AB=4厘米,点C到AB的距离为5厘米,BC⊥CD.且BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2021/3/11/2675377079484416/2681073217044480/STEM/a10723e8b1f244179f1919e1e9b0f62b.png?resizew=458)
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解答题-证明题
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困难
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【推荐1】如图1所示的是某汽车标志,它是由五个全等的菱形拼成的一个轴对称图形,如图2所示的是它的平面示意图,已知B、C、D、E四点在同一条直线上,A,D,F,G四点在同一条直线上,直线
是对称轴.
(1)求证:
;
(2)连接
,若菱形的边长为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/817ed153-341d-420f-8cd0-aac4f4a1cddc.png?resizew=427)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b528818e98c5c2ddf301048b4228d2.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
您最近一年使用:0次
解答题-证明题
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困难
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名校
【推荐2】如图①,点P为
的平分线上一点,以P为顶点的角的两边分别与射线
交于A、B两点,如果
绕点P旋转时始终满足
,我们就把
叫做
的智慧角.
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977263788335104/2978616919973888/STEM/74990f2e-a16a-4065-9341-ec72a97ac895.png?resizew=481)
(1)如图②,已知
,点P为
的平分线上一点,以P为顶点的角的两边分别与射线
交于A、B两点,且
.求证:
是
的智慧角;
(2)如图①,已知
.若
是
的智慧角,连接AB,用含
的式子分别表示
的度数和
的面积;
(3)如图③,C是函数
图象上的一个动点,过C的直线CD分别交x轴和y轴于A,B两点,且满足
,请求出
的智慧角
的顶点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091145fcc157587a3fc8e0b7c7c0ecb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7210c6456f176a922bfa6f20dc27a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977263788335104/2978616919973888/STEM/74990f2e-a16a-4065-9341-ec72a97ac895.png?resizew=481)
(1)如图②,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091145fcc157587a3fc8e0b7c7c0ecb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fddda9e7f4d7140bf357d76c9e23d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(2)如图①,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5726c3f0d2b930aa88beed06b5710686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(3)如图③,C是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4115c4fbc17d33752e8273a168d4689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949c54239b18a0e5ebde26d120362f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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