DCG Study Topics
Have a look at the examples below from our students. There's no one right note making style but whatever you do, things that help are:
 Use colour to help make things clear
 Summarise the steps involved  don't just copy the page from the textbook
 Draw a diagram
Orthographic Projection of Curves
A basic skill that you need to know.
 30 degree slices
 Ordinates
 Working with cones
 Section planes
Oblique PlaneA general skill that comes up in lots of different questions.

Geologic Geometry
Mining  see pp 353356 & pp 362363
 Terminology: stratum, headwall, footwall, dip, strike, borehole, outcrop
 Understanding contour lines
 Drawing an elevation from a contour map
 Finding strike, dip & thickness
 How to draw a skew borehole
 Using auxiliaries so solve problems
Earthworks  see 357361 & 367369
 Terminology: formation, cuttings, embankments
 Level roads including bends
 Inclined roads (where do you draw the semicircle?)
Envelopments
See pp 201205
 What is an envelopment?
 Prisms
 Cylinders
 Partial envelopments
Skew Lines
2 varieties, both quite similar. Very practicable. See pp168170
 Finding a 5th point, E
 Using E in plan to find X1Y1
 Determining direction of X2Y2
 Finding shortest distance
 Projecting back to plan and elevation
Axonometric ProjectionSee pp7483

Isometric Projection 