A metre and a linear metre are the same unit of measurement - the word "linear" is used merely to distinguish it from a square or cubic metre, of two or three dimensions.
When you have a shape which is X metres by Y metres, you multiply the X by the Y and the result is the area of the shape in square metres. Imagine a shape 5 metres by 3 metres. 3 x 5 = 15 square...
This question cannot be answered in a sensible way. A metre is a measure of length, with dimensions [L]. A cubic metre is a measure of volume, with dimensions [L3]. Basic dimensional analysis teaches...