Not sure about 1 aecar (what is that?) , but 100 cents = 1 acre.
1 acre = 43560.17 sqft divide that by 3 = 14520.06 sqft
43560 square feet in one acre
2400 sqft is one ground
269.23
1418 sqft = 131.74m2
one biswa is equeal to 1360 sqft. according to this 1360* 3 = 4080 sqft
2,800 sqft is 0.064 acre.
It depends on how many square feet the box will cover. I found two different brands: one covered 22.93 sqft, the other 17.59 sqft. your room is 12' x 14' = 168 sq.ft so 168 sqft / (22.93 sqft / box) = 7.32 boxes for my first example and 168 sqft / (17.59 sqft / box) = 9.55 boxes for my 2nd example Hope this helps
Base it off : 12" thick a yard of concrete will go 27sqft. 6" thick will go twice as many sqft so 54 sqft. 4" thick will go 3 times as many sqft so 81 sqft 2" thick will go 6 times as many sqft so 162 sqft and at 1" thick it will go 324 sqft. So at 5" thick...1 yard of concrete will go 67.5 sqft
1,000 sqft (40 x 50 = 1,000)
1 bigah equal to73906 sqft