Since we've correctly calculated the area two different ways, they have to be the same number, and that's why the squares of one, one, two, three, five and eight add up to eight times 13.
因为我们用两种不同的方式计算面积, 同样一个矩形的面积 一定是一样的, 这样就是为什么 1, 1, 2, 3, 5, 8 的平方和, 等于 8 乘 13.