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The area of the quadrilateral can be calculated by taking the base (14 inches) and multiplying it by the perpendicular height (3 inches), then dividing by 2 since the quadrilateral is composed of two triangles.
Area = (14 * 3) / 2
Area = 42 / 2
Area = 21 square inches
So, the area of the quadrilateral is 21 square inches.