CHAPTER SEVEN
PROJECTION OF POINTS, LINES
AND PLANES
Objectives:
At the end of the chapter, students should be able to:
♦ Discuss reference line, picture planes and views
♦ Classify lines based on direction, type etc.
♦ Explain the orthographic projection of points and
lines ( principal, vertical and inclined lines etc)
♦ Draw the true length of an oblique lines
♦ Explain how to draw a point view of a line
♦ Define principal planes
♦ List out the main difference between types of principal
planes
♦ Explain the use of edge view and steps to draw an
edge view of a plane
♦ Discuss the procedures how to draw true shape/size
of oblique or inclined planes