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Two 8" holes is close. Area is the difference of the square of a side (square) or diameter (circle), so a 4" circle has four times the surface area of a 2" circle. pi x radius squared gives the area of a circle. The area of a 6" circle = 3.14 x 3 squared = 3.14 x 9 = 28.25 square inches 28.25...