### Coordinate System

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A. Cartesian Coordinate System
a. 2D Cartesian Coordinate System
• Determined by the X and Y axes (X axis on horizontal lines, Y axis is vertical)
• Writing (x, y)
b. 3D Cartesian Coordinate System
• Determined by the X, Y and Z axes (X style on the horizontal line, vertical Y axis, and Z style as the point height level)
• Writing (x, y, z)
B. Polar Coordinate System

The Polar coordinate is a coordinate system used to describe a certain distance at a certain angle from the last point. The angle of rotation is counterclockwise (counterclockwise).

Polar coordinate function:
Search for objects (examples; lines) with a certain length with a certain angle/slope.

Write format:
@distance

Application example:
the first point is 14.4
the second point is @ 8
Polar Coordinate System
C. Relative Coordinate System
2D and or 3D Relative Coordinates are coordinate systems used to describe distances relative to the previous point.

Polar coordinate function:
The work of an object (example; line) with a certain length, width and height.

Writing format:
2D format @ length, width or
3D format @length, width, height

Examples of application to 3D:
the first point is @1,1
the second point is @ 3,2,2

D. Absolute Coordinate System
The Absolute Coordinate is the coordinate system used for 2D fields, these coordinates are determined by the X and Y axes.

Polar coordinate function:
The work of an object (example; line) with a certain length, width and height.

writing format:
(x), (y)

Application example:
point A 4.4

Reference source:
Sastra M Suparno. 2014. Be Excellent Designer with AutoCAD Revisions Edition. Jakarta (ID). PT Elex Media Komputindo.

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