This would be more accurately answered if given more information on the size of the square. The formula you would use is
area = width × height
and then divide by 2.
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A 12 in square has an area of 12 * 12 = 144 sq inches. Half that area is 72 sq inches.
Then its area will only be a quater of once it was.
A half square meter is equal to 0.5 square meters. To calculate the area of a square, you multiply the length by the width. Therefore, if a square has sides that are each 1 meter in length, the area would be 1 square meter. Half of that would be 0.5 square meters.
Area of half a circle in square m = pi*radius2 divided by 2
A square of half acre in area is approx. 147.6 ft x 147.6 ft.