The answer will depend on the units for 80 and 120 - inches, feet, miles, metres etc - which you have chosen not to disclose. It is therefore impossible to give a sensible answer.
80 m2 equates to about 861.11 square feet.
80 feet x 8 feet = 640 square feet.
1600 square feet 20 x 80 = 1600
There are 80*80 = 6400 sq feet.
6400 square feet
It is: 120*80 = 9600 square feet
80 ft x 120 ft = 9600 ft2 of concrete
80
86,400 Sq. Ft.
80*80 = 6400 square feet
It is: 120+80+120+80 = 400 feet
6.3245553 To get square feet, multiply base times the height (or the two sides). So, assuming the dimensions you offered are in feet, 10' X 4' = 40 square feet.
80 acres = 3,484,800 square feet
44.4 square feet.
80 m2 equates to about 861.11 square feet.
80 feet x 8 feet = 640 square feet.
32 feet times 80 feet = 2,880 square feet