Cartesian Workspace

AutoCAD using Cartesian (x , y) coordinates to locating a point

Cartesian Coordinate System

AutoCAD uses cartsian coordinates (X, Y) to locating a point in the drawing

X: Horizontal distance from origin (0,0)
Y: Vertical distance from origin (0,0)

Polar Coordinate System

AutoCAD uses polar coordinates (distance, angle) to measure angle

One distance, one angle from origin (0,0)

Absolute Coordinates

Can be cartesian or polar coordinates
Coordinates start from the origin (0,0)

Relative Coordinates

Can be cartesian or polar coordinates
Coordinates start from any point other than origin

Polar Angle

By default, AutoCAD measure angle in counter-clockwise

Dynamic Input

Status Bar - Drafting Settings - Dynamic Input

Dynamic Input let you view the command prompt and input in the drawing
It also automatically detect the relative coordinates without menually input the @