It's also used to indicate a room or a construction of that size, 'ho' meaning a square (for example, hofun (square tumulus) and seihokei (square)), and having the length of 'jo.'
またその広さの部屋や建物の事で、「方」には四角形の意味（ex.方墳、正方形）が在り、「丈」の長さをもつ「方」ということ。