The seventh-grade class is building target areas for a PE activity. The bases for the game will be circular in shape. The diameter of each circle is 5 feet. Approximately how many square feet of the turf need to be painted for a base circle? Use 3. 14 for π and round your answer to the nearest tenth. 15. 7 square feet 19. 6 square feet 42. 8 square feet 78. 6 square feet.