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一個圓的周長是8釐米,在這個圓中,90°的圓心角所對的弧長是(2)釐米
圓心角為150度,那麼每一度圓心角對應的弧長為48/150=0.32cm.而圓心角為360度 即:圓的周長為:0.32*360=115.2cm
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