28. Looking out his apartment window that is 20 feet above the ground and directly over the front door, Han could see a red flower on the sidewalk. As shown below, the angle formed by the building and Han's line of sight to the flower is 35°. Approximately how many feet from the front door is the flower?（Note: tan 35° ≈ .70, cos 35° ≈ .82, sin 35° ≈ .57)