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The document describes several types of lines that comprise an orthographic projection system used for technical drawings: 1) Straight lines can be parallel or perpendicular to reference planes. 2) Oblique lines intersect reference planes at angles other than 90 degrees. 3) Frontal, horizontal, and vertical lines are parallel or perpendicular to specific reference planes. 4) An extreme line is perpendicular to the picture plane.
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Line
- 3. FRONTAL LINE (parallel to VP) VP HPHP VP h r’ r1 R r r2 h’ h h’
- 4. VP HPHP VP S s HORIZONTAL LINE (parallel to HP) s' s' s v’ v v’ v
- 5. Recta paralela a los dos planos VP HPHP VP r' R r r' r
- 6. VERTICAL LINE (perpendicular to HP) VP HPHP VP h r' r R r h r' h' h'
- 7. VP HPHP VP v' s S s'v'EXTREME LINE (perpendicular to PV) v s s' v