More than 200 acres, including Arlington Mansion.
624 meters=2,047.24409 feet
400 meters by 200 meters is about 19.8 acres.
You can't calculate meters into acres or acres into meters because they are incompatible measurements. If it was meters squared, that might be a bit different.
20,000 square meters is 4.94 acres.
595 square meters = about 0.15 acres. (0.147027702 acres)
800 square meters = about 0.2 acres. (0.197684305 acres)
3,600 square meters = about 0.9 acres. ( 0.889579373 acres)
0.11 acres is 445.2 square meters.
Answer: 5,486 square meters = 1.35562 acres.
Answer: 395 acres = 1,598,508.286 square meters.
62 acres is 250,905 square meters.