When adding forces in two dimensions, it is easy to find the magnitude of the resultant force using the Pythagorean Theorem. The resultant is the hypotenuse of a triangle made by the two forces.
It is also easy to find the direction of the two forces. First, look at the image to the right.
Force A is up and Force B is at a right angle to it (also known as being ).
Because of the nature of vectors, and because forces are vectors, the image can be redrawn so that the tail of one force originates at the head of the other.
The result of that is to the left, below.