There are two same trangles ABC and DEF overlapped.What`s the area of shadow?人工翻译，不要用电脑！

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There are two same trangles ABC and DEF overlapped.What`s the area of shadow?人工翻译，不要用电脑！
两个全等的△ABC和△DEF重叠，求阴影部分面积。
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