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因為扇形=兩條半徑+弧長若半徑為R,扇形所對的圓心角為n°,那麼扇形周長:C=2R+nπR÷180扇形面積公式在半徑為R的圓中,因為360°的圓心角所對的扇形的面積就是圓面積S=πR^2,所以圓心角為n°的扇形面積:S=nπR…
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