You are indicating that the land is circular since it has a circumference.

If the area is 1200 acres (there is no such measurement as square acres).

1200 x 43,560 (sq ft in acre) = 52,272,000 sq ft divided by pi = 16,647,133 sq ft, take square root = 4,080.09 feet = radius of circle

C = (pi) d, or C= pi ( 2 x r) C= 25,622 feet divide by 5,280 = 4.85 miles

If I didn't mess up the math.

If the area is 1200 acres (there is no such measurement as square acres).

1200 x 43,560 (sq ft in acre) = 52,272,000 sq ft divided by pi = 16,647,133 sq ft, take square root = 4,080.09 feet = radius of circle

C = (pi) d, or C= pi ( 2 x r) C= 25,622 feet divide by 5,280 = 4.85 miles

If I didn't mess up the math.