题型:填空题
难度:0.65
引用次数:326
题号:9800087
如图,将Rt△ABC绕直角顶点C顺时针旋转90°,得到△A′B′C,连结AA′,若∠1=20°,则∠B=_____ 度.
![](https://img.xkw.com/dksih/QBM/2020/3/15/2419864655282176/2420179285573632/STEM/24c854ecd3a04021948a3075553ed115.png?resizew=170)
更新时间:2020-03-15 18:10:16
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