40x40=1,600 sq. ft. 100 sq. ft. in a square. 16 square. Allow extra for the starter row and the cap unless you are going to use a ridge vent.
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40
If you have 10 squares and each is shaded 40 percent, then each square has 40 percent of its area shaded. To find the total shaded area in all 10 squares, you can multiply the percentage shaded by the number of squares. Therefore, 40 percent of 10 squares means that the total shaded area across all squares is equivalent to 4 full squares being shaded.
At the beginning of the game, there are 40 spaces that don't have checkers on them.
1 square = approx 9.28 sqm 40 squares = approx 371.2sqm
two hundred forty tiles