On a tennis court there are five lines. The line all the way at the back is the base line, the one in the front is the service line, the line making the T shape is the center service line, the first line on the left or right is the ally line, and the second line on the left or right is the side line.
The two longest outside lines on a tennis court are called the doubles lines or doubles sidelines.
When the ball is out side the court lines
Yes. You use the outside lines.
Tennis court lines are referred to as the "baseline", "service line", "singles line", "doubles line", and "center line". There is also a small "center mark" protruding from the court in the middle of each baseline.
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Those lines are baselines, if you are referring to the boundary lines on both sides of the tennis court which run parallel to and are at the greatest distance away from the net.
They are called the tram lines
the tennis court at Falkland palace royale tennis club in Scotland is the oldest tennis court