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
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15,120 square inches.
12ft 2 in * 7ft 2 in = 121/6 ft * 71/6 ft = 87.1944... sq feet
Multiply the two dimensions to get the area. In this case the calculation gives you 7,708 square inches, which divided by 144 gives you 53.53 square feet.
It is: 7 times 3 = 21 square feet
7ft equates to 213.36cm