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它的半徑,直徑和周長的和是18.56cm r+2r+2πr=18.56 9.28r=18.56 r=2cm 圓面積為π*r^2=3.14x4=12.56cm²; 這個圓的面積去掉四分之一,還剩12.56x3/4=9.42平方釐米
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