Which of the following statements about the area of polygons is true?
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The area of a polygon can be calculated using the formula A = 1/2 * base * height.
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The area of a polygon is always greater than the area of its circumscribed circle.
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The area of a regular polygon can be calculated using the formula A = (1/4) * n * s^2 * cot(π/n).
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The area of a polygon is independent of its shape.