Other Markings
The centre circle is marked at 9.15 m (10 yd) from the centre spot. Similar to the penalty arc, this indicates the minimum distance that opposing players must keep at kick-off; the ball itself is placed on the centre spot. During penalty shootouts all players other than the two goalkeepers and the current kicker are required to remain within this circle.
The half-way line divides the pitch in two. The half which a team defends is commonly referred to as being their half. Players must be within their own half at a kick-off and may not be penalised as being offside in their own half. The intersections between the half-way line and the touchline can be indicated with flags like those marking the corners – the laws consider this as an optional feature.
The arcs in the corners denote the area (within 1 yard of the corner) in which the ball has to be placed for corner kicks; other players have to be 10 yards away during a corner, and there may be optional lines off-pitch 10 yards away from the corner on the goal- and touch-lines to help gauge these distances.
Read more about this topic: Association Football Pitch