420ft*100ft = 42000 sq ft = 0.964 acres
160' X 80' is, 29.384% of one acre.
To convert the dimensions of a lot from feet to acres, you first need to calculate the total square footage. In this case, 80 feet x 100 feet equals 8,000 square feet. To convert square feet to acres, divide by 43,560 (the number of square feet in an acre). Therefore, a lot measuring 80' x 100' is equivalent to approximately 0.1837 acres.
...............100ft x 225ft=22,500sq.ft an acre is 660ft x 66ft=43,560sq.ft 22,500/43,560=0.52 acres(about), or 1/2th acre
80ft x 50ft = 80 x 50 = 4,000 (square feet).
0.6887 acres is close to the size of a 100' by 300' lot.
80 x 80 x 12
8 x 80 = 640 ft2.
12in/ft x 100ft = 1200
If would be 100ft x 100ft x 10ft. The first story of a Hotel.
200' x 650' = about three acres. (2.9843893480257115 acres).
143,875,000 acres