16.97 square feet
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Radius squared times pi 12X12=144X3.14=452.16 452 sq. ft.
13.2077 cm (12x12) + (12x12)= 288 square root of 288 = 13.2077...
If it is such that you cannot break it into squares, one main square with others attached. Measure each space and add them together. Measure the outside walls and get the perimeter. This will give you a figure Say a total of 48 feet. Treat that like it was the measurement of a square room. Divide that by 4, you get 12. A square room 12 feet to a side. 1 width times 1 length give you the square footage. 12x12=144. The perimeter is the same on a square room or a star if is the same length, it is going to enclose the same square footage.
It is 144 square feet.
144 square feet