In the preceding section, you found that positive or negative is sufficient for the direction of a vector in one dimension. However, in 2D and 3D, positive or negative just isn't enough. There are two different forms for describing a vector in 2D: polar coordinates and Cartesian coordinates. **Polar coordinates** are a little more intuitive, so let's look at them first.

## Polar CoordinatesVector where is the magnitude of A and θ is the direction. |

Figure 4.2 illustrates polar coordinates.

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