Enlargement Positive integer SF (NJT)

What stays the [b]same[/b] and what [b]changes[/b] when you move[br][list][br][*]the SF slider[br][*]the centre[br][*]the vertices A,B and C?[br][/list][br]Are there any points that do not move under this transformation?
[color=#0a971e]Created by N.Trubridge[/color]

Information: Enlargement Positive integer SF (NJT)