Descriptive Geometry · Module 2

Line

Traces, slope and special positions

Projections of a line, its trace points and lines in special positions.

2 lessons
~18 min
2 interactive constructions

Start with the first lesson In the knowledge map

Lessons

Every lesson stands on an interactive construction – turn it, move the points, then build it yourself.

1
Lesson 1High school~8 minContinue here
Projections of a line
The projection of a line is again a line – two projected points suffice.
2
Lesson 2High school~10 min
Trace points
Where a line pierces π₁ and π₂ – and why a trace always sits on the ground line.