Reconstruct a diagram where 10 straight lines, of finite length, form 12 intersections, viz:

----------------------
Intersections      by
   formed        Lines
    7              2
    4              3
    1              4
----------------------

Describe this relatively simple arrangement.

(In reply to Question about terminology by Larry)

My reply to you in email was:
If I was to consider that question in terms of the crossing of two roads then I have one intersection.  Use that concept in the problem.
In the queue Jer was discussing segments.  In my mind then, two lines crossing result in 4 segments.  I hope that answers your question.

Posted by brianjn on 2013-12-13 18:57:49