Use the drawing below to answer the question that follows. The drawing is of an equilateral triangle, where point B is the point at the top, and points A and C are the points at the base on the left and right respectively. A line (df) has been drawn horizontally across the middle of the triangle, creating a smaller triangle above and a trapezoid below. The length of the line (df) is 6. The length of the base of the triangle (AC) is 8. Line df is drawn across equilateral triangle ABC, creating trapezoid AdfC. Using your knowledge of geometry, determine the area of trapezoid AdfC and explain your method.