1 . 如图,点
是
边
上的一点,射线
交
的延长线于点
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33bcd619b7d30f32e70db3fa0d44875.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03bbe78a4db584f95e9e78a6bfda14b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33bcd619b7d30f32e70db3fa0d44875.png)
![](https://img.xkw.com/dksih/QBM/2016/11/2/1578993159020544/1578993159405568/STEM/88392b929db44407bf2d68670fc3a38e.png?resizew=175)
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2 . 如图,AB是半圆的直径,点O为圆心,OA=5,弦AC=8,OD⊥AC,垂足为E,交⊙O于D,连接BE.设∠BEC=α,则tanα的值为_________________ .
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572256949780480/1572256955678720/STEM/95633480dd88443da987f31bf78e4dc2.png?resizew=144)
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3 . 如上图,EB、EC是⊙O的两条切线,B、C是切点,A、D是⊙O上两点,如果∠E=46°,∠DCF=32°,则∠A的度数是________
![](https://img.xkw.com/dksih/QBM/2011/6/7/1570238435598336/1570238440374272/STEM/5e7c092980854c6290813da476d5c3e1.png?resizew=168)
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