There are 12 inches in one foot. Therefore, 7 feet 2 inches is equal to 7 + (2/12) = 7.16 recurring (that is, 7.16666...) feet.
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12ft 2 in * 7ft 2 in = 121/6 ft * 71/6 ft = 87.1944... sq feet
7*12=84 so 84 inches by 84 inches, then use Pythagoras theorem a^2+b^2=c^2 sqrt(84^2+82^2)=118.79 inches
31 inches = how many feet and inches 2 feet and 7 inches
2 feet 6 inches = 30 inches
2 feet = 2 feet x12 inches = 24 inches24 inches + 6 inches = 30 inches