quadrature exciting watt

例句：

1. 1.The area of the square is 45 square meters.
   这个正方形的面积是45平方米。
2. 2. The square has four sides and a center point.
   这个正方形有四条边和一个中心点。
3. 3. The square was completed in one day.
   这个正方形一天就完成了。