Check out these articles for a simple free tool and tutorial that will make trig simple enough for ANYBODY to understand!
http://www.ehow.com/how_5520340_memorize-trig-functions-losing-mind.html
http://www.ehow.com/how_5227490_pass-mind-part-unknown-sides.html
http://www.ehow.com/how_5428511_pass-part-ii-unknown-angles.html
The answer depends on what information you have about the other sides and angles.
The answer depends on what x is meant to represent. Without that information, the question is a waste of time.
I find it very interesting.
The answer depends on what other information is available to you.
The length of what?
The answer depends on what other information is available to you.
trigonometry
Trigonometry is used to find the properties of triangles and Pythagoras' theorem is used to find the lengths and angles of right angle triangles.
Mechanics use trigonometry to find angles mostly used in body or chassis work.
By using trigonometry
Use trigonometry.
Anyone who knows more trigonometry than you and is able to convey that information effectively. A person with loads of qualifications does not necessarily make a teacher.