如图,在四边形ABCD中,∠ABC=90°,⊙O经过A、B、C三点,交AD于点E,连接OD、OB,
,∠ODC=∠OBA.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/21bdd5c3-1e0a-45e3-85a7-05fb11019387.png?resizew=164)
(1)判断CD与⊙O的位置关系,并说明理由.
(2)若
,⊙O的半径为4,求AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9672cc271c7f79973c34a1e179782762.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/21bdd5c3-1e0a-45e3-85a7-05fb11019387.png?resizew=164)
(1)判断CD与⊙O的位置关系,并说明理由.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81904e99b0518cf2fa1e155d13973a1f.png)
更新时间:2022-06-15 16:21:38
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相似题推荐
解答题-计算题
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【推荐1】如图,在平面直角坐标系中,
,
是矩形
的两个顶点,双曲线
经过
的中点
,点
是矩形
与双曲线
的另一个交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/84180e4e-49fc-426b-9854-0f6a3d51a364.png?resizew=363)
(1)点
的坐标为 ,点
的坐标为 ;
(2)动点
在第一象限内,且满足
;
若点
在这个反比例函数的图象上,求点
的坐标;
若点
是平面内一点,使得以
为顶点的四边形是菱形,请你直接写出满足条件的所有点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9703cc262fd0f2ab62ab1bb91313b3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86acf63b2b7c89ccb8c47244b325f273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea16ceca816f7d3d50650af141baf42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30afe6b1f06761d437dfc1569e2d04be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](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/3ea16ceca816f7d3d50650af141baf42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/84180e4e-49fc-426b-9854-0f6a3d51a364.png?resizew=363)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0642b460538d20b1f0fb7058451cbb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbd3ca3f8440aa36b10962ca06cf5cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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真题
【推荐2】【问题探究】
(1)如图1,锐角△ABC中,分别以AB、AC为边向外作等腰△ABE和等腰△ACD,使AE=AB,AD=AC,∠BAE=∠CAD,连接BD,CE,试猜想BD与CE的大小关系,并说明理由.
【深入探究】
(2)如图2,四边形ABCD中,AB=5cm,BC=3cm,∠ABC=∠ACD=∠ADC=45º,求BD的长.
(3)如图3,在(2)的条件下,当△ACD在线段AC的左侧时,求BD的长.
(1)如图1,锐角△ABC中,分别以AB、AC为边向外作等腰△ABE和等腰△ACD,使AE=AB,AD=AC,∠BAE=∠CAD,连接BD,CE,试猜想BD与CE的大小关系,并说明理由.
【深入探究】
(2)如图2,四边形ABCD中,AB=5cm,BC=3cm,∠ABC=∠ACD=∠ADC=45º,求BD的长.
(3)如图3,在(2)的条件下,当△ACD在线段AC的左侧时,求BD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/8dbaba88-3695-4309-bff5-069b21c20442.png?resizew=493)
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解答题-作图题
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较难
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【推荐1】如图,从
上一点A引出弦
和切线
,连接
,若
,
,请仅用无刻度的直尺,分别在图1,图2中画出符合下列条件的直线
.
(1)在图1中,画直线
;
(2)在图2中,画
的切线
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/44477634-bff5-4720-9992-168a774a74ee.png?resizew=336)
(1)在图1中,画直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c631670e02d2a38e9c78708a3916140.png)
(2)在图2中,画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图1,已知
,
,
,
,点
为边
上的任意点(不与点
,点
重合),以
为直径的
交边
于点
,点
,半径为
,连结
交
于点
,连结
.设
.
的代数式表示出
;
(2)若
,
,求
的长(用含有
的代数式表示);
(3)若
,如图
,若
与边
相交,求
的取值范围;
(4)若
为
中点,
是以
为腰的等腰三角形,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d50515fc65885d44cd6a3c41e6a7e.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4252b38dab4bf807aa0e3b6378c6a8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbde88c76a98a051a13e1b83df8cbd15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2332c0698d463d56f4a31546231fd034.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db200af875946b149bd04aa31fe8bb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(4)若
![](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/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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名校
【推荐3】问题发现:
![](https://img.xkw.com/dksih/QBM/2020/3/11/2417003970928640/2417381513347072/STEM/277b1027052e4664b99258644727ddd3.png?resizew=461)
(1)如图①,正方形ABCD的边长为4,对角线AC、BD相交于点O,E是AB上点(点E不与A、B重合),将射线OE绕点O逆时针旋转90°,所得射线与BC交于点F,则四边形OEBF的面积为 .
问题探究:
(2)如图②,线段BQ=10,C为BQ上点,在BQ上方作四边形ABCD,使∠ABC=∠ADC=90°,且AD=CD,连接DQ,求DQ的最小值;
问题解决:
(3)“绿水青山就是金山银山”,某市在生态治理活动中新建了一处南山植物园,图③为南山植物园花卉展示区的部分平面示意图,在四边形ABCD中,∠ABC=∠ADC=90°,AD=CD,AC=600米.其中AB、BD、BC为观赏小路,设计人员考虑到为分散人流和便观赏,提出三条小路的长度和要取得最大,试求AB+BD+BC的最大值.
![](https://img.xkw.com/dksih/QBM/2020/3/11/2417003970928640/2417381513347072/STEM/277b1027052e4664b99258644727ddd3.png?resizew=461)
(1)如图①,正方形ABCD的边长为4,对角线AC、BD相交于点O,E是AB上点(点E不与A、B重合),将射线OE绕点O逆时针旋转90°,所得射线与BC交于点F,则四边形OEBF的面积为 .
问题探究:
(2)如图②,线段BQ=10,C为BQ上点,在BQ上方作四边形ABCD,使∠ABC=∠ADC=90°,且AD=CD,连接DQ,求DQ的最小值;
问题解决:
(3)“绿水青山就是金山银山”,某市在生态治理活动中新建了一处南山植物园,图③为南山植物园花卉展示区的部分平面示意图,在四边形ABCD中,∠ABC=∠ADC=90°,AD=CD,AC=600米.其中AB、BD、BC为观赏小路,设计人员考虑到为分散人流和便观赏,提出三条小路的长度和要取得最大,试求AB+BD+BC的最大值.
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解答题-作图题
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名校
【推荐1】【材料】自从
义务教育数学课程标准
年版
实施以来,九年级的晏老师通过查阅新课标获悉:切线长定理由“选学”改为“必学”,并新增“会过圆外的一个点作圆的切线”,在学习完
切线的性质与判定
后,她布置一题:已知:如图所示,
及
外一点
求作:直线
,使
与
相切于点
李蕾同学经过探索,给出了如下的一种作图方法:
,分别以
、
为圆心,以大于
的长为半径作弧,两弧分别交于
、
两点(
、
分别位于直线
的上下两侧);
②作直线
,
交
于点
;
③以点
为圆心,
为半径作
,
交
于点
点
位于直线
的上侧
;
④连接
,
交
于点
,则直线
即为所求.
【问题】
(1)请按照步骤完成作图,并准确标注字母(尺规作图,保留作图痕迹);
(2)结合图形,说明
是
切线的理由;
(3)若
半径为
,
依据作图痕迹求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b0e787c1d82071c825975348698f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e18aca23d8c1a62015e28708afadd5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d6ab1c9400857cb5ce47ad8f50535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b0e787c1d82071c825975348698f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461950348087cdb06ec28d7569d14c1f.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/a8b201c0b1a56b34d73edd645222957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a36a9dc09e4ed89c47993141ea124fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64dc1ab9bf65cfdaac7633e9a7958ff.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e47fa61fb1bd6b3889f2fd840d84965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
【问题】
(1)请按照步骤完成作图,并准确标注字母(尺规作图,保留作图痕迹);
(2)结合图形,说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec797a10275d35cfe5949c15caea545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
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【推荐2】如图,AB是⊙O的直径,点P是弦BC上一动点(不与B,C重合),过点P作PE⊥AB,垂足为E,在射线EP上取点D使得DC=DP,连接DC.
(1)求证:DC是⊙O的切线;
(2)若∠CBA=30°,射线EP交⊙O于点 F,当点 F恰好是弧BC的中点时,判断以B,O,C,F为顶点的四边形是什么特殊四边形?说明理由.
(1)求证:DC是⊙O的切线;
(2)若∠CBA=30°,射线EP交⊙O于点 F,当点 F恰好是弧BC的中点时,判断以B,O,C,F为顶点的四边形是什么特殊四边形?说明理由.
![](https://img.xkw.com/dksih/QBM/2017/6/5/1702491182456832/1703202704384000/STEM/0ff9cf41511d4af08d82261be8c8f213.png?resizew=171)
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【推荐1】在
中,
,
,
,点P是射线
上的动点,连结
,将
沿着AP翻折得到
.设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/32ae9c32-b53f-48c6-b145-a1ce6cd19495.png?resizew=462)
(1)如图1:当点D在
上时,求x的值.
(2)如图2:连结
、
,当
时,求
的面积.
(3)如图3:以
为边长,在
左侧构造正方形
,直接写出x的值,使得点 E、F中有一点落在直线
或直线
上.
![](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/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e304ffcbf08135d4697a47be072c3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/32ae9c32-b53f-48c6-b145-a1ce6cd19495.png?resizew=462)
(1)如图1:当点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2:连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c64885f4af4df0b963fe9c6bde8ffdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
(3)如图3:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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名校
【推荐2】如图1,在菱形ABCD中,AB=6
,tan∠ABC=2,点E是射线DA上的一个动点,连接CE,将线段CE绕点C顺时针旋转一个角α(α=∠BCD),得到对应线段CF.
(1)求证:△BCE≌△DCF;
(2)求线段DF的长度的最小值;
(3)如图2,连接BD、EF.BD交EC、EF于点P、Q.当△EPQ是直角三角形时,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30efdb9c7eb4b788352056f3edf21635.png)
(1)求证:△BCE≌△DCF;
(2)求线段DF的长度的最小值;
(3)如图2,连接BD、EF.BD交EC、EF于点P、Q.当△EPQ是直角三角形时,求DE的长.
![](https://img.xkw.com/dksih/QBM/2018/12/31/2108747312218112/2112070322872320/STEM/c66b4b002a76497eb8977ea2c2552bce.png?resizew=323)
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【推荐3】(1)[问题情境]
小春在数学活动课上借助几何画板按照下面的画法画出了一个图形:
如图1,点C是线段AB上一点,分别以AC、AB为底边在线段AB的同侧作等腰三角形ACP、等腰三角形ABQ,PC、AQ相交于点D.当P、Q、B在同一直线上时,他发现:
.请帮他解释其中的道理;
(2)[问题探究]
如图2,在上述情境下中的条件下,过点C作
交PB于点E,若
,
,求CE的长.
(3)[类比应用]
如图3,
是某村的一个三角形鱼塘,点D、E分别在边AB、BC上,AE、CD的交点F为鱼塘的钓鱼台,测量知道
,
,
,且
.直接写出CF的长为_______m.
小春在数学活动课上借助几何画板按照下面的画法画出了一个图形:
如图1,点C是线段AB上一点,分别以AC、AB为底边在线段AB的同侧作等腰三角形ACP、等腰三角形ABQ,PC、AQ相交于点D.当P、Q、B在同一直线上时,他发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f128812fd6a9070a164219444cd65465.png)
(2)[问题探究]
如图2,在上述情境下中的条件下,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2995cb695f4f25f9506a1c29f9d90fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387c86337f281157b64851102646cf24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d290ba4e68ceb344c7320bbb54926c.png)
(3)[类比应用]
如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63961a85bd5d613495a8ec7860e87ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a5d99bbd3550498d37ec8b87d76f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ab243ef9e6594d285505e629e85a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20d76a8922ae0805af17b1ce2188e17.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974107489984512/2981884844457984/STEM/0da9a0ee-ea0b-4a74-944b-0e54232e85cf.png?resizew=618)
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