Length (l) is the same as width (w) and their product is 64.

Length (l) is the same as width (w) and their product is 64.

We're given 2 equations:

1. lw = 64
2. l = w

Substitute equation (2) into equation (1):
w * w = 64
w^2 = 64
w = 8
Since l = w, then l = 8