如图，正方形ABCD边长为4，以BC为直径的半圆O交对角线BD于E．则直线C

如图，正方形ABCD边长为4，以BC为直径的半圆O交对角线BD于E．则直线CD与⊙O的位置关系是 ▲ ，阴影部分面积为(结果保留π) ▲ ．

答案

相切（2分），π

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