A way to describe the location of a
point on a plane. A point is given coordinates (r, θ). r is
the distance from the point to the origin. θ is
the angle measured counterclockwise from the polar
axis to the
segment connecting the point to the origin.
Note: With polar coordinates
a given point has many possible representations. θ has
many possible values depending on which coterminal
angle is chosen,
and r can be positive or negative.
conversion formulas, area
using polar coordinates, polar
derivative formulas, parametric