Hello Tutor Friend! I have one secret to easily mastering technical drawings especially drawing with "AutoCAD". The secret is the Mastery of Understanding the Coordinate System. If we already understand the coordinate system, I guarantee everyone will quickly understand all forms of functions/commands in AutoCAD.

**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.