In math class, Xiaolan cut a circular piece of paper with an area of 9.42 square centimeters. Can you guess how many square centimeters she needs to prepare at least?
数学课上，小兰剪了一个面积是9.42平方厘米的圆形纸片，你能猜出她至少要准备多少平方厘米的正方形纸片．
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