如图,在
中,
,Ⅰ是
的内心,连接
并延长至点
,使
.则
的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9693da3141d4af5e8deb0fd17dd5aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6126e48e99d041c955e93e980a0d95da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-23 17:52:55
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【推荐1】如图,点
是
的劣弧
上一点,连接
,
,
,
,
交
于点
,若
,
,则
( )
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506411523702784/2507181102178304/STEM/9821a2e5166b4ace8d38a88b5e6234d8.png?resizew=116)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee54b9b398ce80cd054b56173fe810f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53411c19d804ca7844d719b2fca2659f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506411523702784/2507181102178304/STEM/9821a2e5166b4ace8d38a88b5e6234d8.png?resizew=116)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在
中,
是
的垂直平分线,连接
.以A为圆心,任意长为半径画弧,分别交
于点E,F,分别以E,F为圆心,以大于
长为半径画弧,两圆弧交于G点,作射线
交
于点H,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32196181948a3bc96d6090a853d5f7b9.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/81f7843cca6b10db8aace89936c1ca22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d092504d3c33c48be43f23b788efd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130a5779fb467b31ef7d405553b586d7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/066d14de-a1c9-4d22-9a8b-64550ac09989.png?resizew=215)
A.36° | B.25° | C.24° | D.21° |
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【推荐2】如图,矩形ABCD中,点G是AD的中点,GE⊥BG交CD于点E,CB=CE,连接CG交BE于点F,则∠ECF的度数为( )
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760281636372480/2796074796744704/STEM/9ee9e775-8973-4e18-b081-230a9c2a8be9.png)
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760281636372480/2796074796744704/STEM/9ee9e775-8973-4e18-b081-230a9c2a8be9.png)
A.30° | B.22.5° | C.25° | D.15° |
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【推荐1】如图,点I是Rt△ABC的内心,∠C=90°,AC=3,BC=4,将∠ACB平移使其顶点C与I重合,两边分别交AB于D、E,则△IDE的周长为( )
![](https://img.xkw.com/dksih/QBM/2019/5/30/2214665952903168/2216067526868992/STEM/1bf9de39172344d083cfa6f72377f628.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/2019/5/30/2214665952903168/2216067526868992/STEM/1bf9de39172344d083cfa6f72377f628.png?resizew=138)
A.3 | B.4 | C.5 | D.7 |
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【推荐2】如图,I为
的内心,有一直线通过I点且分别与AB、AC相交于D点、E点
若
,
,则I点到BC的距离为何?( )
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758635156242432/2758985123905536/STEM/1f13009d017749a69cc73dfccfae8660.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b70419d498a0672197837b69bb5811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cfe17f6298b49c3760a4c97519694c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08284feb0b476945b55b1927dc4255b6.png)
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758635156242432/2758985123905536/STEM/1f13009d017749a69cc73dfccfae8660.png?resizew=161)
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解题方法
【推荐3】已知等边三角形ABC.如图,
(1)分别以点A,B为圆心,大于的
AB长为半径作弧,两弧相交于M,N两点;
(2)作直线MN交AB于点D;
(2)分别以点A,C为圆心,大于
AC的长为半径作弧,两弧相交于H,L两点;
(3)作直线HL交AC于点E;
(4)直线MN与直线HL相交于点O;
(5)连接OA,OB,OC.
根据以上作图过程及所作图形,下列结论:①OB=2OE;②AB=2OA;③OA=OB=OC;④∠DOE=120°,正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/6/20/2488491326734336/2492463358238721/STEM/5a959bccd1774f93937f2d9856cd5ead.png?resizew=224)
(1)分别以点A,B为圆心,大于的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)作直线MN交AB于点D;
(2)分别以点A,C为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)作直线HL交AC于点E;
(4)直线MN与直线HL相交于点O;
(5)连接OA,OB,OC.
根据以上作图过程及所作图形,下列结论:①OB=2OE;②AB=2OA;③OA=OB=OC;④∠DOE=120°,正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/6/20/2488491326734336/2492463358238721/STEM/5a959bccd1774f93937f2d9856cd5ead.png?resizew=224)
A.①②③④ | B.①③④ | C.①②③ | D.③④ |
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