label its dimensions after you rule a square the same area as this rectangle on the back of this sheet 16mm ,4mm

Ar = L*W = 16 * 4 = 64 mm^2. = Area of

rectangle.

As = L*W = 64
L = W
As = L*L = 64
As = L^2 = 64
L = 8 mm.
W = L = 8 mm.