Answer: you alredy solved it
Step-by-step explanation:
Rectangle
try it with a briefcase and put a cardboard in it (of cours you don't have a brief case, it has gone mostly extinct)
ok, try it with a laptop
close the laptop
how can you read what I'm typing when you close your laptop
close the laptop
slide a paper into the middle of the opening
open laptop
surprise, it is a rectangle
rectangle
The scale factor's 3 since 12 and 4 can be divided by 3 and -6 and -2 can also be divided by 3.