It is an arc, with a radius of 10 yards, centered on the penalty mark. It is drawn outside of the penalty area only and it's endpoints are on the top edge of the penalty area, 18 yards out from the goal line. It's maximum perpendicular distance from the top edge of the penalty area is 4 yards.
That is the penalty arc. Its center is the penalty mark and has a radius of 10 yards. During a penalty kick, all non-kicking players must be outside of the penalty area and also the penalty arc at the moment of the kick.
1 yard
It is a part of a circle with a radius of 10 yards, where its center is the penalty mark. It is 2 yards from the penalty area boundary at its furthest point.
The D, otherwise known as the penalty arc, marks an exclusion zone where no outfield players are allowed to stand during the taking of a penalty kick. The distance between any point on the penalty arc, and the penalty spot itself, is 10 yards (9.15 metres).
You are probably referring to the penalty arc which is at the top to the penalty area. It is not exactly a half of a circle.Prior to the taking of a penalty kick all players except the kicker and the opposing goal keeper must be outside of the penalty area and at least 10 yards from the penalty mark. The penalty mark is only 8 yards from the edge of the penalty area! So an extra bit of distance is added to show the players where they must be.
If a foul is given within the penalty arc (the D-shaped bit at the top and center of the penalty area), it will not result in a penalty kick. The area enclosed by the arc is not part of the penalty area. The arc's only purpose is to ensure that players remain 10 yards away from the ball during penalty kicks.
The penalty arc is used to keep all players ten yards away from the ball during a penalty kick.
It is called the penalty box and is the biggest of the two boxes and is touching the half circle or penalty arc.
A direct free kick for the attackers at the location of the infraction. The penalty arc is not part of the penalty area.
The penalty arc ensures that all players are at least 10 yards away when a penalty kick is being taken. It is not considered to be part of the penalty area.
There is no "penalty kick circle." There is a penalty arc, which is part of a circle.
It is an arc that is drawn outside of the penalty area with a radius of ten yards and the center being the penalty mark. (Note: the mark is only 6 yards from the edge of the penalty area area) Whenever a penalty kick is taken all players, except the kicker and the goal keeper, must be outside of the penalty area, at least ten yards from the mark, and not closer to the goal line than the mark. Other than the taking of penalty kicks, it has no other function.