Drawing and Editing Fundamentals
What you must understand
Commands, coordinate entry, and object snaps form the backbone of this domain. Know absolute, relative (@), and polar (@distance<angle) coordinate syntax and how direct distance entry pairs with Ortho or Polar tracking. Understand selection mechanics: window versus crossing window, fence, and the difference between picking an object and cycling through overlapping objects. Grips, trim/extend with the implied Edge and crossing options, offset through a point, fillet versus chamfer, and the modify commands (move, copy with Array, mirror, rotate with Reference) are all fair game.
Traps that appear in questions
- Window selection selects only fully enclosed objects; crossing selects anything touched. Questions love to flip this.
- Copy with the Array option and the separate ARRAY command differ; know the classic rectangular/polar array parameters.
- Trim and Extend are now one command; the Mode option toggles which behavior applies.
- Object snap overrides set during a command apply to the next pick only.
- Rotate's Reference option resets the base angle, which trips candidates who assume rotation is always absolute.
Worked example
To draw a line 50 units long at 30 degrees from the previous point, type @50<30. To rotate a rectangle so its existing 12-degree edge becomes horizontal, start ROTATE, pick the base point, choose Reference, pick the two endpoints of that edge, then type 0. The object rotates by the difference, not to 12 degrees.
Rule of thumb
When a question describes a result, trace the command sequence backward: identify the base point, the reference, and the selection method before choosing an answer.