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Lesson Summary
Graphical Projections
There are three types of axonometric projections:

- Isometric
- Dimetric
- Trimetric

Isometric Projection - a type of parallel projection where the x and z axes are inclined to the horizontal plane at the angle of 30 degrees. The angle between axonometric axes equals 120 degrees.

In an isometric drawing, true length distances can only be measured along isometric lines. These are lines that run parallel to any of the isometric axes. Any line that does not run parallel to an isometric axis is called a non-isometric line.

These non-isometric lines include inclined and oblique lines and can not be measured directly. They must be created by locating two endpoints.

Hidden lines are omitted in isometric drawings unless they are necessary to describe the object.

Centerlines are drawing only for showing symmetry or for dimensioning.

Dimension lines and extension lines shall lie in the same plane. All dimensions and notes must be unidirectional.