如图,在四边形ABCD中,∠DAB=30°,点E为AB的中点,DE⊥AB交AB于点E,DE=
,BC=2,CD=4.
(1)求∠ABC的度数.
(2)求CE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/454268b5-4d0f-4655-85e0-b4232af6d5e5.png?resizew=231)
(1)求∠ABC的度数.
(2)求CE的长.
更新时间:2020-10-11 21:48:17
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【推荐1】如图, 在△ABC中, AC⊥BC, AC=BC, 直线EF交AC于F, 交AB于E, 交BC的延长线于D, 连结AD、BF, CF=CD.
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631257558933504/2633294643347456/STEM/1fb1f2b9-4f25-4bc7-bc11-6d0e925ff97c.png)
求证:(1)
;
(2)试判断BF与AD的位置关系,并加以说明.
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631257558933504/2633294643347456/STEM/1fb1f2b9-4f25-4bc7-bc11-6d0e925ff97c.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6042477b94f8f5b3407f6bb1a8389375.png)
(2)试判断BF与AD的位置关系,并加以说明.
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【推荐2】如图,在
中,
,点
是边
上一点,
,点
在边
上.
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149093564227584/3155507702251520/STEM/b789c69012254952992bbd7e61f1303f.png?resizew=159)
(1)若
,求证:
;
(2)若
,
,求
的度数;
(3)若
,试判断
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.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/df4a2a127d89d50d3fde881a9b58ef0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149093564227584/3155507702251520/STEM/b789c69012254952992bbd7e61f1303f.png?resizew=159)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102e836344156ea835d7d4e9b4120fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9693da3141d4af5e8deb0fd17dd5aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b8ee3c2174306999d94daf1fcea4a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
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【推荐1】已知:如图,
是
的高线,
的垂直平分线分别交
于点
.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
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![](https://img.xkw.com/dksih/QBM/2020/3/12/2417898536706048/2417949398663168/STEM/e26bde02ba3c485eaec2e084fb113f6c.png?resizew=201)
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【推荐2】如图所示,直线l表示一条公路,点
表示两个村庄,现在要在公路l上建一个垃圾中转站P,并使垃圾中转站P到两个村庄的距离相等,垃圾中转站P应建在何处?在图上标注出垃圾中转站P的位置.(不写过程,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/1879024e-c899-471a-afac-7479f46e0445.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5725e3e4eb05b32563b4ee1d473756c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/1879024e-c899-471a-afac-7479f46e0445.png?resizew=192)
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【推荐1】如图,菱形
中,分别延长
,
至点
,
,使
,
,连接
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/e1c89006-9b69-4b9a-a9f7-4685ba8f24ca.png?resizew=248)
(1)求证:四边形
是矩形;
(2)如果
,菱形
的面积为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3b0b5010813ccc388a41ba74f3b932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/e1c89006-9b69-4b9a-a9f7-4685ba8f24ca.png?resizew=248)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc50ecfa45216f8d098662452cf8d08.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6093eebca8f3ff82ce9298feb197e955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐2】定义:有两条边长的比值为
的直角三角形叫做“魅力三角形”我们知道,命题“直角三角形30°角所对的直角边等于斜边的一半”是一个真命题,所以“含30°角的直角三角形”就是一个“魅力三角形”
(1)设“魅力三角形”较短直角边为a,较长直角边为b,请你直接写出
的值.
(2)如图,在Rt△ABC中,∠B=90°,BC=6,D是AB的中点,点E在CD上,满足AD=DE,连结AE,过点D作DF∥AE交BC于点F
①如果点E是CD的中点,求证:△BDF是“魅力三角形”
②如果△BDF是“魅力三角形”,且BF=
BC,求线段AC的长
【二次根式运算提示:(
)2=n2(
)2=n2a,比如:(4
)2=42
(
)2=16×3=48】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)设“魅力三角形”较短直角边为a,较长直角边为b,请你直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
(2)如图,在Rt△ABC中,∠B=90°,BC=6,D是AB的中点,点E在CD上,满足AD=DE,连结AE,过点D作DF∥AE交BC于点F
①如果点E是CD的中点,求证:△BDF是“魅力三角形”
②如果△BDF是“魅力三角形”,且BF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
【二次根式运算提示:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c403b5306aa1b123e29393069b09b2be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d012d124f04963fb72a68af40d5f8f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2020/1/31/2388736761012224/2389575332184064/STEM/dfde5fea59c24a1396f139110d520625.png?resizew=153)
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【推荐2】如图,四边形ABCD中,AB⊥AD,已知AD=3cm,AB=4cm,CD=13cm,BC=12cm,求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586387094175744/2588585762643968/STEM/c927c963a7714fc5adaf441b7b6ff2ed.png?resizew=106)
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