None.
A decimal (if that is what you were trying to spell) is a representation of a number: it is not a measure of area nor any other characteristic.
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9.
At least one, provided he is not enormous.
Since 12" by 12" is one foot by one foot or one square foot, 1237 of these tiles will feet in 1237 square feet.
You measure how many units will fit inside of the area. For example, if you own a plot of land and want to know the area in square feet, construct a lot of squares that are one foot square. Then put as many of those square as will fit into the plot without any overlapping or any gaps. Count the number of squares that fit into the plot.
We have no problem fitting an equilateral triangle into a square. It depends on the size of the triangle and the size of the square whether one can be fit inside the other.