It is very easy just apply the trignometric ratios ull get the second side to find the third side u will need to use phytagoras theorem. good luck.
It is a right angle triangle and its largest angle is 90 degrees
If 2 sides are known then use Pythagoras' theorem to find the 3rd side of a right angle triangle.
180-x-y (x and y are the sides you already know) there are 180 degrees in a triangle. The remaining # is the last angle
if the triangle has one right angle in it
Depends on the Triangle. Right triangles with a 90 degree angle: http://en.wikipedia.org/wiki/Pythagorean_theorem
It is a right angle triangle and its largest angle is 90 degrees
add all of the sides together
If 2 sides are known then use Pythagoras' theorem to find the 3rd side of a right angle triangle.
180-x-y (x and y are the sides you already know) there are 180 degrees in a triangle. The remaining # is the last angle
A right angle triangle has 3 sides as does all other types of triangles.
if the triangle has one right angle in it
Depends on the Triangle. Right triangles with a 90 degree angle: http://en.wikipedia.org/wiki/Pythagorean_theorem
The 90 degree angle in a right angle triangle is opposite its hypotenuse.
(base x height) / 2
If it has an hypotenuse then it is a right angle triangle and if you know its angles then use trigonometry to find its other two sides.
The cotangent is used when you want to find an unknown angle in a right angled triangle when two sides (not the hypotenuse) and the included right angle are known.
Depending on which sides and angle are known you would use one of the trigonometry functions.