**mathematically**.

By convention, the direction of a vector is measured by the angle the vector makes with the

**positive x-axis**, in the

**anti-clockwise**direction. From the figure, this is \(40^{\circ}\). This is just a convention, but, it is a convention that we will follow throughout the website.

Going in the anti-clockwise direction means that we will start from the +x-axis and move

**up**to reach the vector, not

**down**.