Answer:
40 cm by 44 cm
Step-by-step explanation:
A square sheet of paper has area 1600 cm^2.
area = s^2
1600 cm^2 = s^2
s = sqrt(1600 cm^2)
s = 40 cm
The side of the square was 40 cm, so the square measured 40 cm by 40 cm.
One side of 4 cm short, so the paper should have been 40 cm by 44 cm.