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.
Kita telah mengira luas dengan dua cara yang berbeza, hasilnya mesti sama, sebab itu kuasa dua kepada 1, 1, 2, 3, 5 dan 8, jumlahnya sama dengan 8 x 13.