List and describe the two types of coordinate systems commonly used for planar geometry?

In Coordinate System there are two Axis, Horizontal Axis Called  X-axis and Vertical Axis Called Y-axis. The Point where X-axis and Y-axis intersect called Origin Point. The two Coordinate system used by planar geometry are given below.

1. Absolute coordinate System

The Coordinate system having infinity point and the point have three reading that  X,Y,Z. According to Absolute Coordinate system the reading of any coordinate point can be given by Origin Point for example the point is how much away from Origin point / X-axis, Y-axis and Z-axis reading shown as (10,50,0)

2. Relative Coordinate System

According to Relative Coordinate system the origin point will be continuously changed from next point to next point.

The1st reading of coordinate point can be given by Origin Point / Absolute Coordinate System or click by Mouse , when reading of2nd point required than previous point become origin point by using symbol @.  for example the2nd point is how much away from1st point reading shown as (@10,50,0)

-absolute coordinates

- relative coordinates You have two type: 1) Relative rectangular2) Polar rectangular

- absolute coordinates, refer to x,y axis

- relative coordinates You use symbol @ for relative from last point 

You have two type: 1) Relative rectangular @DX,DY where DX, DY are increments from last point along x, y axis Command:

LINE (return) From point:2,5 (return) To point: @10,-3 (return) 

You have point2+10=12,5-3=2 i.e. (x=12,y=2,z=0)

 2) Polar rectangular @Distance<AngleXY Where AngleXY is angle from East axis (along x) and positive counterclockwise (East=0, North=90 ...) based from setting for angle in UNITS command

 Command: LINE (return) From point:0,0 (return) To point: @100<30 (return) Same result if you use clockwise angle with supplementar360-30=330 Command: LINE (return) From point:0,0 (return) To point: @100<-330 (return)