In Polar Coordinates, points are designated by their distance, r, from the origin, and their angle, θ, measured counterclockwise from a ray starting at the origin.  An equation that gives r for an arbitrary θ is said to be a "polar equation", and can be plotted, giving rise to many interesting shapes.

Contents of this section: Polar Coordinates Conversion between Polar and Rectangular Sliding stick; quadrifolium

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