如图,△ABC,AC=3,BC=4,∠C=90°,⊙O为△ABC的内切圆,与三边的切点分别为D、E、F,则⊙O的面积为_____ (结果保留π)
![](https://img.xkw.com/dksih/QBM/2018/5/22/1950720762167296/2010048230481920/STEM/c24d5b9200234b45b3573869432dc8a2.png?resizew=169)
更新时间:2018-08-14 07:16:30
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