#### Cartesian and Polar Coordinates

These coordinate system are two equivalent ways of representing a vector. Use the coordinate system that is most appropriate for the problem.

Cartesian coordinates:   A  =  (Ax,Ay) = Ax + Ay

Polar coordinates:   A = Ar  if the vector begins at the origin. Sometimes we write such a vector as A =(r,θ) Here θ is the angle between the positive x-axis and A. More generally, A = (Ar,Aθ); (see transparency.

Conversion between cartesian and polar coordinates: see transparency.