The area of the polygon is 85.5 square feet. To find the length of the left side, separate the polygon into two rectangles as shown. Polygon in the shape of a rotated letter L, which could be formed by a horizontal rectangle attached along the top part of a vertical rectangle. The top side of the figure is 12 ft, the right side is labeled 6 ft, the bottom side of the upper part is 9 ft. The left side of the entire figure is labeled with a question mark. A vertical dashed segment separates the figure into the left vertical rectangle labeled A and the right horizontal rectangle labeled B You can determine the dimensions of rectangle A once you know the area of rectangle A. Determine the area of rectangle A by subtracting the area of rectangle B from the area of the entire polygon. What is the area of rectangle A? Enter your answer as a decimal in the box.