If you want to increase your level of play, studying billiards play by others and the techniques developed by others will allow you to learn from their experiences. Studying billiards allows to increase your level of play much more quickly than learning from your own mistakes or trying to develop techniques that have already been developed.
Billiards is no longer there.
It doesn't. There is no "mat" related to the game of English Billiards or Pocket Billiards.
This depends upon which billiards game - English Billiards is most popular in the UK. Pocket Billiards is most popular in the US.
The only jobs available for billiards is working at a billiards hall at the counter or as a cleaner.
billiards Players
No. Trigonometry will have little effect on being able to win at billiards or pocket billiards. A study of physics will do more, but only the simplest bank shots are aided by these sciences. The stroke and alignment are more important, and the knowlege of the more complex factors in the game than trigonometry is needed for complex shots.
There are generally two terms used for billiards - English billiards or pocket billiards. Pocket billiards is also called pool. Billiards is a popular bar game that has a number of different names that it has been called over the years but the most notable and popular is simply that of pool.
Billiards covers English Billiards, Carom Billiards, and Pocket Billiards, and each has their own set of rules.
Billiards in the name of a popular cue sport.
Snooker is fairly similar to billiards.
A faulty billiards shot is called a "miscue"
There are many very good books on how to learn billiards. Two of these are The Complete Idiot's Guide to Pool and Billiards and The Illustrated Principles of Pool and Billiards.