Use the area of the rectangle to find the area of the triangle. 2 ft 9 ft A. The area of the triangle is 11 square feet, because the area of the rectangle is 22 square feet. B. The area of the triangle is 9 square feet, because the area of the rectangle is 18 square feet, C. The area of the triangle is 9 square feet, because the area of the rectangle is 9 square feet. O D. The area of the triangle is 18 square feet, because the area of the rectangle is 18 square feet.​