There are 10 unbroken lines - 5 horizontal (parallel to the baseline) and 5 vertical. There are 28 line segments - 14 horizontal and 14 vertical.
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
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.
Yes. You use the outside lines.
A tennis court is 78 feet long.
The net of a tennis court it 21' feet.
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.
There are 7200 square feet in a tennis court. A tennis court measures 120 feet over all court area by 60 feet wide.
They are called the tram lines