1. Subtract the first xcoordinate from the second xcoordinate. For example, if your coordinates are (2, 4) and (4, 12) you would subtract 2 from 4 to get 6. 2. Square the result
http://www.ehow.com/how_6909044_calculatelineard...

1 Linear feet is used to denote length. If you are determining linear feet from a plan, you will simply need to add the length of different pieces together. If you are taking measurements
http://www.wikihow.com/CalculateLinearFeet

There isn't one Linear is only length one foot long square foot is an area with width X breadth measured in inches or feet equaling 1 square foot ,
http://wiki.answers.com/Q/Linear_velocity_calculat...
