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這樣就可以推導出來. 圓的周長是直徑與圓周率的積,對應的圓心角是360度; 一段圓弧弧長則是:該圓弧對應的圓心角與360度的商,再與圓的周長的積. 如果直徑D,圓弧對應的圓心角α,圓周率π,則圓弧弧長公式為: l=πDα÷360
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