Trigonometry is a whole branch of mathematics and does not comprise only one formula!
Trigonometry
There are many.
By using trigonometry or Pythagoras' theorem
The answer depends on what other information is available to you.
Trigonometry is a whole branch of mathematics and does not comprise only one formula!
Trigonometry
No, because trigonometry is a big subject: there are many formulae.
trigonometry
There are many.
By using trigonometry
By using trigonometry or Pythagoras' theorem
Trigonometry
trigonometry
The answer depends on what other information is available to you.
moivre's formula
As with all triangles: base x height ------------------ 2 Base is one side of the triangle, and height is a line drawn perpendicular from it to the opposite vertice (corner). If you want to get into Trigonometry, there's another way, but I forget it. Sorry.