Arectangular building layout is considered to be a square if
a. the diagonal measurements are the same length
b. two opposing walls are parallel
c. one angle is 90 degrees
d. two opposing walls are the same length

A if the diagonal measures are the same length

Answer(a) cheap enough for small shops to purchase;

Overwritten or erased text files e-mails because since they are overwritten or erased they do not appear in an exam of the rom. in the rom you can find easily email that is not being erased or rewritten, as they are stored in memory, but if they are erased or overwritten those records cannot be accessed in a second moment.