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Mr Abd Rahim

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Mr Abd Rahim
CHAPTER 17: PLAN AND ELEVATION

17.1 Key Terms

Orthogonal projection - Unjuran ortogon
Plan - Pelan
Front elevation - Dongakan depan
Side elevation - Dongakan sisi
Full scale - Skala penuh
Solid line - Garis penuh ( used to draw visible edge)

Dashed line - Garis putus-putus (used to draw invisible edge)

Fine solid line - Garis penuh yang halus (used to show projection/ construction line)

[pic]

17.2 Orthogonal projection
The orthogonal projection of an object is a two dimensional or flat image of the object. The image is formed by looking at perpendicular lines, that is , the normal coming from the object and intersecting the plane of view.

Tick ( √ ) the correct orthogonal projections

|1 |Orthogonal projection on a horizontal plane |
| | |
| |[pic] |
|[pic] |[pic] |
| | |
|2 |Orthogonal projection on a horizontal plane |
| | |
| |[pic] |
|[pic] |[pic]

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