如图，将含60°角的直角三角板ABC绕顶点A顺时针旋转45°

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如图，将含60°角的直角三角板ABC绕顶点A顺时针旋转45°度后得到△AB′C′，点B经过的路径为弧BB′，若∠BAC=60°，AC=1，则图中阴影部分的面积是

A．

B．

C．

D．

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