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原本半徑為25.12/3.14=4則面積為4*4*3.14=50.24 新增1/4後半徑為4+4*1/4=5 周長為5*2*3.14=31.4 面積為5*5*3.14=78.5 所以周長新增了6.28面積新增了28.26
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