Brute Force (i.e., WYSIWYG ;-)
Macros (i.e., Cloning)
Scalling
Rotated Axes
Origin
of Entities in Rotated Axes
Croocked Axes
Three Dimensions
Clipping
Marked
Locations
Getting Distances
Getting Directions
Getting Coordinates, Intersection Points
Objects
Attachment Coordinates
Exported Marks
Attachment Marks
Observations
Axes and Charts (Pie/Bar/XY) + +
Diagrams (Spread/Grid/Tree) + +
+
Other Challenges and Pointers