有图.如图,将锐角为30°、60°的直角三角形从较长的直角边BC呈水平状态开始,在平面内滚动一周,求C点转动的角度.------------------------------------------------------------------------------------------------------
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![有图.如图,将锐角为30°、60°的直角三角形从较长的直角边BC呈水平状态开始,在平面内滚动一周,求C点转动的角度.------------------------------------------------------------------------------------------------------](/uploads/image/z/7073469-45-9.jpg?t=%E6%9C%89%E5%9B%BE.%E5%A6%82%E5%9B%BE%2C%E5%B0%86%E9%94%90%E8%A7%92%E4%B8%BA30%C2%B0%E3%80%8160%C2%B0%E7%9A%84%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E4%BB%8E%E8%BE%83%E9%95%BF%E7%9A%84%E7%9B%B4%E8%A7%92%E8%BE%B9BC%E5%91%88%E6%B0%B4%E5%B9%B3%E7%8A%B6%E6%80%81%E5%BC%80%E5%A7%8B%2C%E5%9C%A8%E5%B9%B3%E9%9D%A2%E5%86%85%E6%BB%9A%E5%8A%A8%E4%B8%80%E5%91%A8%2C%E6%B1%82C%E7%82%B9%E8%BD%AC%E5%8A%A8%E7%9A%84%E8%A7%92%E5%BA%A6.------------------------------------------------------------------------------------------------------)
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