Question

hii frndszz...

how to find direction for vectors and what is triangle law of vector addition? !!..

Answer 1

by rotating axis you can change the direction of vectors.

Triangle law of vector addition states that when two vectors are represented by two sides of a triangle in magnitude and direction taken in same order then third side of  that triangle represents in magnitude and direction the resultant of the vectors.

This simply means that, if you have a two vectors that represents the two sides of the triangle then the third side of that triangle will represent their resultant.

Here is an example:

Answer 2

direction of vectors can be find by applying tanβ formula and triangle law is explained in the attachment....
hope you found that helpful....