The Compendium Geometry is an eBook providing facts, formulas and explanations about geometry. 
Home Coordinate Systems 2D Polar Coordinate System  
See also: Conversion of Coordinates, Cylindrical Coordinate System, Spherical Coordinate System, Cartesian Coordinate System  
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Twodimensional Polar Coordinate SystemThe polar coordinate system (sometimes also referred to as "circular coordinates") specifies the position of a point P_{1} by the combination of its distance to the origin (radius) and the angle between the polar axis and the line P_{1}O. Note, that the angle is positive in counterclockwise direction and negative in clockwise direction. The value of the angle is measured in radians (0..2π) or degrees (0..360°).
The distance d between two points P_{1} [r_{1},φ_{1}] and P_{2} [r_{2},φ_{2}] is defined by


Home Coordinate Systems 2D Polar Coordinate System 