如图,☉O内切△ABC于D,E,F,∠B=50°,∠C=60°,则∠FDE的度数为( )
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061286000459776/2062833092853760/STEM/51a00cfbfff34e5485f5f1e916591637.png?resizew=80)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061286000459776/2062833092853760/STEM/51a00cfbfff34e5485f5f1e916591637.png?resizew=80)
A.50° | B.55° |
C.60° | D.70° |
更新时间:2018-11-07 13:17:59
|
相似题推荐
单选题
|
较难
(0.4)
【推荐1】如图,△ABC是⊙O的一个内接三角形,AB+AC=6,E是△ABC的内心,AE的延长线交O于点D,且OE⊥AD.当△ABC的形状变化时,边BC的长( ).
![](https://img.xkw.com/dksih/QBM/2017/8/17/1754072762884096/1759981640040448/STEM/9bde58321d3d4cb79d160b33a184febb.png?resizew=120)
![](https://img.xkw.com/dksih/QBM/2017/8/17/1754072762884096/1759981640040448/STEM/9bde58321d3d4cb79d160b33a184febb.png?resizew=120)
A.有最大值4 | B.等于3 | C.有最小值3 | D.等于4 |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】如图,在等边
中,
,将
绕点C逆时针旋转
(
),得线段
,连接
,作
的平分线
交射线
于点E.下列三个结论:①
;②当
时,
;③
面积的最大值为
.其中正确的结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b7b8ee010fcc6aa1a0139ae64fa5ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a929fca455b19682d2a26ecc302123d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c0a61e30802d1aeed49a6b26ff31b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2851a545df34a849ca2815c261e3f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
A.①②③ | B.①② | C.①③ | D.②③ |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,
为
边的中线.以点
为圆心,以
为半径作弧交
于点
,再分别以
,
为圆心,以大于
的长为半径作弧,两弧相交于点
,作射线
射线
与
分别交于点
、点
,连接
,以下结论正确的有几个( )
(1)点
是
的外心;(2)
平分
;(3)
;(4)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47b19432a4c617b6d9ea123148596e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05c0865815d839db9ccc6cf4a98c6d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81613520ab5a478f0b2616a9bcb79d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9aca873131d7b68f996ade4923d96f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75f289fdc092cf3ad17492155c6dcef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47b19432a4c617b6d9ea123148596e4.png)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
单选题
|
较难
(0.4)
名校
【推荐2】如图,
中,
为
的内心,
,则
的周长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab98fab95d3ff98dace28eb2c37d034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712c5428f1acaff0772389f9831c5953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318ada70337d0ea725700c5cd1ce0e82.png)
![](https://img.xkw.com/dksih/QBM/2020/5/3/2454635567079424/2455165705338881/STEM/277ad2ad69804e56a272364b0b55592e.png?resizew=171)
A.6 | B.5 | C.4.8 | D.4 |
您最近一年使用:0次