A standard tennis court for doubles measures 36 feet wide and 78 feet long. The net posts are positioned 3 feet outside the doubles sidelines, resulting in a distance of 21 feet from the center of the court to each net post. The height of the net is 3 feet at the center and 3.5 feet at the posts. This configuration ensures that the court accommodates the larger playing area required for doubles matches.
They are - the two service courts in tennis are simply the left and right side of the court. See http://daynamanning.ca/archives/2005/11/tennis_court_di.htm for details on court dimensions, post positions, etc.
The net should be 3' (36") or 91.5cm at the center strap, and 3'6" (42") or 106.5cm at the post. You can stand your racquet on the ground for reference.
In netball, the penalty spot is located 7 meters from the goal post. This distance is measured from the center of the goal post to the penalty mark on the court. Players taking a penalty shot must shoot from this spot when a foul occurs within the shooting circle.
There is no specific rule or regulation for the placement of the umpire's chair. Generally speaking, it is positioned to the side of one net post, tangential to the net, so that the umpire may see both sides of the court as "evenly" as possible. The chair may be placed directly beside or a few feet from the net post, away from the court.
It is impossible to make a rope or such line hang straight, since it will always stretch out and form a hyperbolic shape
There are multiple places to post tennis shoes for sale online. You can post them to Craigslist.com for your area and eBay. Those two are the best source to list them.
pulley and wheel axle
3.5ft or 4ft
Mule
120 yards.
8 yards
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