In this video you are shown the vector triangle for addition and subtraction of vectors in 2 dimensions.

Vector Addition and Subtraction (2D version) : ExamSolutions Maths Revision - youtube Video

Worked Examples

I would encourage you to try the following examples as they demonstrate common methods with vectors and act as revision of the topics looked at so far.

Example 1

Vectors : Example 1 : ExamSolutions - youtube Video

Example 2

Vectors : Example 2 : ExamSolutions - youtube Video