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49 square feet. Multiply length by width - the result is the area in square feet.
Oh, dude, you just take the radius, which is 7 feet, square it (49), multiply it by pi (approximately 3.14), and voila, you get an area of about 153.86 square feet. Like, who even needs to know that, right?
If the area of a square is 49 square centimeters, the length of each of its sides are: 7 cm.
The area of a square with perimeter 28cm is: 49 cm2
Entire surface area: (2*pi*49)+(14*pi*10) = 747.7 square feet