straightedge is:
* Infinitely long
* Infinitesimally thin (i.e. point width)
* Always assumed to be without graduations or marks, or the ability to mark
* Able to be aligned to two points with infinite precision to draw a line through them

It may not be marked or used together with the compass so as to transfer the length of one segment to another.

It is possible to do all compass and straightedge constructions without the straightedge.

1.Previous
3.Next