you have asked the wrong question it's called a penalty box there is no such thing as a freekick box
There are two kinds of freekicks in soccer: direct and indirect. A direct freekick can be a shot at the goal, or a pass to another player. An indirect freekick must touch another player before attempting a goal. The freekick is awarded after a foul or penalty, and the opposing team must be 10 yards from the ball. The kick is performed from the location where the foul occurred; if the foul was within the goal area, then the freekick starts there.
The "D" is the semi circle on the edge of the 18 yard box. If a freekick is won in this area the commentator will sometimes say, 'a freekick in the "D" '.
the 18 yd box is mostly used for goal kicks, the keeper's bounderies, and penalty kicks. for goal kicks, the ball must go beyond the 18 yd box. the keeper can only use his/her hands inside the box. if there is a foul commited in the box then you get a direct freekick 12 yds away from the goal.
The typical freekick achieves speeds between 80 and 100km\h. An Adidas Jabulani weighs 440 grams.
There is no penalty box in outdoor soccer. I believe there is for indoor soccer.
To decide how bad the challenge was and if it should be an indirect free kick, direct freekick and if it is worthy of a yellow or red card.
Some channels show you the distance between the ball and the goal at freekicks. They also show the speed of the shot. On average a freekick is between 80 and 100km\h.
A box of full of sweaty goalkeepers.