About 1/2 acre (0.459137 acres).
100 x 2 = 200 / 43,560 = .0045913
Answer: 20,000 ft² = 0.459136 acre
0.505 acres.
1 acre is 43,560 square feet, 200 acres is 8,712,000 square feet
100' by 200' is 0.459 acre.
Answer: 113,400 ft² = 2.60330 acres
About 1.8 (1.83654729) acres.
20,000 square feet is 0.46 acres.
100 x 100 = 10,000 sq ft; 10,000sq ft / 43,560 sq ft per acre = .2295684 acres
200 feet wide x 900 feet deep is 4.132 acres.
400 ft * 200 ft = 80000 sq ft = 1.837 acres (to 3 dp)
2.75 acres.