What is the scale factor of the triangle dilated from OPQ to OP’Q’ from center 0 explain or show work

Answer:
2/5
Step-by-step explanation:
Each side of OP'Q' is 2/5 of OPQ. Ex) OP = 10, OP' = 4.
I'm not so good with scale factor but the smaller triangle which is in red would be half the size of the outher 1