You didn't specifiy the measurements so here's a couple:
30ft x 24ft = 720sqf
30in x 24in = 5sqf
720 square feet.
24 x 30 = 720 square feet.
30 x 40 = 1200 square feet.
30 acres = 1,306,800 square feet.
20' x 30' = 600 square feet.
30 feet x 30 feet = 900 square feet 900 square feet = 83.612736 square metres.
24 x 30 = 720 square feet.
5 square feet
60
570 square feet.
30' x 24' is 720 square feet. (just multiply the two dimensions: 30 x 24 = 720)
30 square meters = ~322.92 square feet.
30 feet x 30 feet = 900 square feet.
30 x 40 = 1200 square feet.
30 acres = 1,306,800 square feet.
20' x 30' = 600 square feet.
30 inches by 5 feet = 12.5 square feet.
30 inches by 10 feet = 25 square feet.