Yes it is perfectly leagal
An NBA size Basketball court is 94 feet from baseline to baseline and 50 feet from sideline to sideline.
yes the player is allowed to move so far along the baseline
Baseline so you can trap him there. Middle is the main focus of your defense.
2 point area
Assuming you mean back and forth from sideline to sideline or baseline to baseline, that would be called a suicide.
it is the big thick line behind the back board
The baseline in basketball is the boundary line running along the width of the court. This line is used to pass in the ball when the opposite teams scores.
NCAA and NBA: 2 courts of 47 feet by 50 feet each w/ 2 inch dividing center line. 94' 2" total length (inside) baseline to baseline High School: 2 courts of 42 feet by 50 feet each w/ 2 inch dividing center line. 84' 2" total length (inside) baseline to baseline. FIBA: 2 courts of 45.93 by 49.21 feet each w/ 2 inch dividing center line. 92.03' total length (inside) baseline to baseline.
Basketball teams must be prepared to beat a trapping team. Many teams will use a full-court press which is designed to trap the basketball, while other teams will use a half-court trapping defense or a combination of both. Traps are usually set by two defenders on one offensive player with the ball. The most common areas teams try to trap the basketball are the half-court line, the sidelines and the baseline. * Don't Dribble Into A Trap* Pass The Basketball When You See The Trap Coming* Avoid Common Trapping Area When Possible. (Half-Court, Sideline, Baseline)* Remember If Two Defenders Trap One Offensive Player Then There Will Be An Open Player Somewhere On The Court. Find The Open Player and Pass The Basketball Over the TrapView The Link Below To Coach A Winning Team For In-Depth Article On How To Beat A Trap.