its a rectangle. it also has other shapes inside of the court so look at that too. If you dont know what a tennis court looks like, search tennis court of google images.
Irregular is the best word. It can by rectangular, square, circular, an ellipse or any irregual shape. It can be flat (plane or 2-dimensional) or be uneven. ellipseplane
It all depends, if you have your own court no of course not.
but if your using a public court yes you must pay.
but if a friend or relative owns a public court you may get on
for free, or at a lower...