Linear feet measure something in only one dimension. For example, when finding the length of a bedroom wall, measure from one corner to another and describe the length of the wall
http://www.ehow.com/facts_6852845_differencebetwe...

A square foot is a measure or area a linear foot is a
http://www.chacha.com/question/whatisthediffere...

Sorry, wrong question  a linear foot is a measure of length  a square foot is a measure of area. How many inches fit into a gallon? How many quarts is it from here to the moon?
http://wiki.answers.com/Q/How_many_linear_feet_is_...

I hope this is not for a homework question : The answer is: Derivation: Let. and let the orthogonal projection matrix be. Recall that the least square solution is given by. Then.
http://www.quora.com/Whatisthecovariancematrix...
