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從底圓的中心O連接邊,可以得到半徑為30.已知深度為40,那麼用勾股定律可以求出扇形的半徑為50,漏斗底圓的周長等於60X3.14=188.4.既扇形弧長為188.4.而扇形所在的圓的周長為100X3.14=314.那麼扇形的圓心角等於(188.4/3…
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