如图,四边
是平行四边形,
,
与
的延长线交于点E,连接
交
于F,连接
,下列结论中:①四边形
是平行四边形;②
;③若
,则
;④若
,则
是直角三角形,正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab47a785e0687f42e885e11497b7e969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ce0fa7a463921f370ff90e14ecef85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a114bef3dbdfba560349a7250ffde71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5da44bd1537984418603aca93fc2e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/672e5987-5626-4726-8bc7-6528e92da5b2.png?resizew=181)
A.4 | B.3 | C.2 | D.1 |
更新时间:2023-07-14 07:46:17
|
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【推荐1】如图,四边形ABCD中,连接BD,O为BD中点,∠BAD=90°,∠BCD=90°,∠BDA=30°,∠BDC=45°,则∠CAO=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/9aa5252b-b976-4ed7-871d-75bd4d7b1547.png?resizew=251)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/9aa5252b-b976-4ed7-871d-75bd4d7b1547.png?resizew=251)
A.15° | B.18° | C.22.5° | D.30° |
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【推荐2】如图,已知
和
都是等边三角形,且A、C、E三点共线,
与
交于点O,
与
交于点P,
与
交于点
,连接
.有以下五个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/796cd355-8a33-4282-8fbc-31675cea65b2.png?resizew=211)
①
;②
;③
;④
是等边三角形;⑤
.其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/796cd355-8a33-4282-8fbc-31675cea65b2.png?resizew=211)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7341c7d3b742bf451457145206782711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e5c088a90d0f4052fc92dd9b7addf9.png)
A.5 | B.4 | C.3 | D.2 |
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【推荐1】如图,在
中,
、
的平分线交于点I,若
,
,则
的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/3e856cc0-49ae-49c0-9f82-85217daaae41.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19766bbdc2d23ae20e9f34530c3a1543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8f113377bcaaa7a6b536abe58aa0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/3e856cc0-49ae-49c0-9f82-85217daaae41.png?resizew=159)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在△ABC中,AB=AC,∠A=36°,AC的垂直平分线交AB于E,D为垂足,连接EC,若CE=5,则BC等于( )
![](https://img.xkw.com/dksih/QBM/2018/10/22/2059231512879104/2060593374470145/STEM/537328da8dfb44f1b0417286094e195e.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/2018/10/22/2059231512879104/2060593374470145/STEM/537328da8dfb44f1b0417286094e195e.png?resizew=109)
A.2 | B.3 | C.4 | D.5 |
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【推荐1】如图,在
中,D在
上,E在
上,F在
上,
,
,则下列结论一定正确的是( )
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25eff69a4a0dc7a7ab183843303d333.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
【推荐2】七巧板是一种古老的中国传统智力玩具,如图,在正方形纸板ABCD中,BD为对角线,E,F分别为BC,CD的中点,AP⊥EF分别交BD,EF于O,P两点,M,N分别为BO,DO的中点,连接MP,NF,沿图中实线剪开即可得到一副七巧板.则在剪开之前,关于该图形,下列说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/6c766d05-78e3-4e73-a844-83517bcc6664.png?resizew=140)
①图中的三角形都是等腰直角三角形;
②四边形MPEB是菱形;
③四边形PFDM的面积占正方形ABCD面积的
;
④四边形OPFN是正方形;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/6c766d05-78e3-4e73-a844-83517bcc6664.png?resizew=140)
①图中的三角形都是等腰直角三角形;
②四边形MPEB是菱形;
③四边形PFDM的面积占正方形ABCD面积的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
④四边形OPFN是正方形;
A.①②③ | B.①③ | C.①③④ | D.②④ |
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