**Vectors:** Any quantity can be described in 2 ways: a **Scalar** or **Vector**. **‘Scalar’** is a quantity which only has magnitude (number only). ‘**Vector’** is a quantity which has both magnitude and direction (which way it’s heading towards).

**Vector representation in 1-D:**

It’s magnitude is denoted by **| A |** and its direction is given by a unit vector of length = 1, but heading towards a certain direction!

A unit vector is denoted by , and its magnitude is given by, | | = 1.

**Vector representation in 2-D:**

From the above graph, we see that the vector forms a right triangle, so use **Pythagorean Theorem** to find | V |.

**Direction of 2-D Vector:**

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