It also fits 10 feet by 4.5 feet, 20 feet by 2.25 feet, and 8 feet by 5.625 feet rectangular areas. A circle with a radius of 3.8 feet also has 45 square feet. A right-angle triangle 9 feet by 10 feet in size has a 45 square foot area. The area of a square yard is 1 square meter.