要计算正方形的面积，只需用边长自乘即可。
To calculate the area of a square double the length of one side.
另一项是对着正方形的面积来估算一条线的长度——对亚洲人说更容易一些。
In another, they estimated the line's length relative to the size of a square - an easier task for the Asians.
答案是5，目前为止，这个平行四边形的面积,是那个正方形面积的5倍。
That's 5. OK, this parallelogram is apparently five times the size of this square.
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