Text: € The hypotenuse added to the altitude equals the area of 2D. i.e., G + F = 2D. € The hypotenuse minus the altitude equals the area of 2E. i.e., G - F = 2E. € The hypotenuse added to the base equals the area of B. i.e., G + C = B. € The sides of these squares are d, e, a, and b, respectively. € They are in the format: b, e, d, a, in which b+e=d and e+d=a, as per Fibonacci, but he did not know this.

See Also:

Source: