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1.圓形面積=π(d/2)^2,所以,直徑為60公分的圓形的面積為 3.14×(60/2)^2=3.14×900=2826平方釐米[1公分=1釐米] 2.側面積=底面周長乘以高,而底面周長為πd,所以, 直徑40公分高15公分圓柱側面面積為: 3.14×40×15=3.14×600=1884平方釐米
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