Using Coordinate Systems

Coordinate is the location of a point in the drawing
2D using X, Y as coordinates

There are 2 types of Coordinate System:

Cartesian Coordinate

Both are Distance

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Polar Coordinate

One Distance, one Angle

Absolute Coordinates

Any coordinates start from origin (0,0)

Usually is the 1st point of draw command

Cartesian Coordinate: 100,50

Polar Coordinate: 100<45

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Relative Coordinates

Coordinates start from any point except origin

Usually id the 2nd point onward of the draw command

Cartesian Coordinate: @100,50

Polar Coordinate: @100<45