It comes back to me now. I had about 36' of counter tops. Since it was less than 4' wide, I was quoted at 36 linear feet. THAT'S where the 4' width came in. I did inadvertenly give a measurement for square feet! pb is right. If you have 14 feet of tops, then you have 14 linear feet.
I think you can still figure out what PART of the 'L' top you need to measure as I described. The long and short of it is: Don't measure any part of the area in question more than once.