A square has only four sides. However, if the question has a typo and means 12 inch sides, then the answer follows:
12 x 12 = 144 / 2 = 72 in2
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A 12 in square has an area of 12 * 12 = 144 sq inches. Half that area is 72 sq inches.
0.19635 square inches.
It is 6*8.5^2 = 433.5 square inches.
2 square inches
Assuming a circle with a diameter of one half inch, A = 2Ï€r so the area in square inches would be half of pi or about 1.57 in2.