一个在正方形的花坛花坛的四周有一条1米宽的小路，小路的面积是20平方米。问在正方形的花坛花坛的面积？

来源：蜘蛛抓取(WebSpider) 时间：2016-12-07 04:47 标签： 一个圆形花坛直径5米
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