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The area and arc length of region ABCD can be calculated using the formulas \( A = \dfrac{\theta}{2}\left(R^2 - r^2\right) \) and \( \Delta s = \theta(R - r) \). Given the values \( R = 3k \), \( r = 2k \), and \( \theta = \dfrac{3}{4} \), the area becomes \( A = \dfrac{3/4}{2}\left((3k)^2 - (2k)^2\right) \). The arc length difference is determined by substituting these values into the arc length formula.
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