67mm wide ; 155 mm long
There is no difference between L x W and W x L For example if L = 5 and W = 3 L x W -> 5 x 3 = 15 W x L -> 3 x 5 = 15
It doesn't matter, the results are the same.A very basic law of arithmetic is: a times b = b times a So, in regard to the calculatuion of area, it DOES NOT MATTER .
Depends on the paper. Computer paper is usually 8.5" by 11". Notebook paper may be 8.5" x 11", but some is slightly smaller.
a ruler or a tape measure