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dsProject/dsRag/Txt/processed_chunks/1081.txt

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关于角、平角、直角和垂直是这样定义的:
8. 平面角是在一平面但不在一条直线上的两条相交线相互的倾斜度。
9. 当包含角的两条直线是一条直线时，这个角叫做平角。
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