已知:平面直角坐标系中,点A在y轴的正半轴上,点B在第二象限,将OB绕O点顺时针转60°至OA.
(1)如图1,试判定△ABO的形状,并说明理由.
(2)如图1,若点E为y轴的正半轴上一动点,以BE为边作等边△BEG,延长GA交x轴于点P,问:AP与AO之间有何数量关系,试证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599988083736576/2601488931037184/STEM/662457a8811b432388ff9c578e6854d8.png?resizew=167)
(3)如图2,若BC⊥BO,BC=BO,作BD⊥CO ,AC、DB交于E,补全图形,并证明:AE=BE+CE.
(1)如图1,试判定△ABO的形状,并说明理由.
(2)如图1,若点E为y轴的正半轴上一动点,以BE为边作等边△BEG,延长GA交x轴于点P,问:AP与AO之间有何数量关系,试证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599988083736576/2601488931037184/STEM/662457a8811b432388ff9c578e6854d8.png?resizew=167)
(3)如图2,若BC⊥BO,BC=BO,作BD⊥CO ,AC、DB交于E,补全图形,并证明:AE=BE+CE.
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599988083736576/2601488931037184/STEM/509c800a44634251a45960704c06bba1.png?resizew=125)
更新时间:2020-11-26 22:05:41
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解答题-证明题
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【推荐1】在平行四边形
中,
是
上一点,
,过点
作直线
,在
上取一点
,使得
,连接
.
(1)如图1,当
与
相交时,当
时,
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577909249318912/2579184612712448/STEM/6c479411-db27-4673-a2fe-ac49de1504b9.png?resizew=255)
①请直接写出
度数为______;
②求证:
;
(2)如图2,当
与
相交时,且
,请你写出线段
,
,
之间的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/a673cc8da2b072062b75bbdd486a18a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6f83567c788db941b7e39f1c3b518d.png)
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577909249318912/2579184612712448/STEM/6c479411-db27-4673-a2fe-ac49de1504b9.png?resizew=255)
①请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ea3a89f74c87aa92e0ae0362f03401.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782a7b8656a7ad52519d7f2079ed6114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720c3b263dc80fa71df59fcaa37ecc1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cb27a48a09b046ae1442b0959f65b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577909249318912/2579184612712448/STEM/3eef1406-4fbd-4530-baa9-88eb30b559ca.png?resizew=216)
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解题方法
【推荐2】如图,已知
和
均为的等边三角形,点
为
的中点,过点
与
平行的直线交射线
于点
.
(1)当
,
,
三点在同一直线上时(如图1),求证:
为
中点;
![](https://img.xkw.com/dksih/QBM/2020/4/26/2456242440953856/2456832237428736/STEM/b40abf6d0eb04a1a9f4043d4983f6fcb.png?resizew=150)
(2)将图1中的
绕点
旋转,当
,
,
三点在同一直线上时(如图2),求证:
为等边三角形;
(3)将图2中
绕点
继续顺时针旋转多少度时,点
恰好第一次位于线段
中点,试作出图形并直接写出
绕点
继续旋转的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c5b84e1529439db61d8886a524242e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
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![](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/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)当
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/2020/4/26/2456242440953856/2456832237428736/STEM/b40abf6d0eb04a1a9f4043d4983f6fcb.png?resizew=150)
(2)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19cf764e6c30d3f1fd797c8be1f8bb0.png)
(3)将图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2020/4/26/2456242440953856/2456832237428736/STEM/ed4be7ec24d54c92acfc21b85826c5e7.png?resizew=161)
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【推荐1】【探索发现】
如图①,
为等腰直角三角形,
,
.以
为边向左侧作
,当
时,以C为旋转中心把
旋转到
的位置.
求证:
.
【类比应用】
如图②,
为等边三角形,以
为边向左侧作
,当
时,以C为旋转中心把
旋转到
的位置.当
,
时,
的长为________.
【拓展应用】
如图③,已知
,
,
.若
,则四边形
的面积为________.
如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c3e84d7f86a58b7a725c85b51a52d8.png)
【类比应用】
如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
【拓展应用】
如图③,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dbf31dfd36aa456a63bafea8bc1985.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/d108c2fd-e497-4132-9b64-1e4c421dc564.png?resizew=442)
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【推荐2】如图1,在
中,
,
于点O,
,
,在
的外部以AB为边作等边
,点E是线段AO所在直线上一动点(点E不与点A重合),将线段BE绕点B顺时针方向旋转60°得到线段BF,连接EF.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/69ae0e5f-3b58-43d2-a9f5-6677b4ec1aaf.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/ee74b541-5636-4ded-8aed-4ca27525802d.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/29886cf8-1cff-4a8e-8c42-0ad15b69013d.png?resizew=203)
(1)求AO的长;
(2)如图2,当点E在线段AO上,且点F,E,C三点在同一条直线上时,求BF的长;
(3)连接DF,若
的面积为3,请直接写出BF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/69ae0e5f-3b58-43d2-a9f5-6677b4ec1aaf.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/ee74b541-5636-4ded-8aed-4ca27525802d.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/29886cf8-1cff-4a8e-8c42-0ad15b69013d.png?resizew=203)
(1)求AO的长;
(2)如图2,当点E在线段AO上,且点F,E,C三点在同一条直线上时,求BF的长;
(3)连接DF,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
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