We determine the scale factor by comparing the lengths of corresponding sides of the square.
The length of O’N’=15 and the length of ¯¯¯¯¯¯¯¯¯¯¯ON=9
The equation for the scale factor, k is then given by:
O’N’=kON
15=9k
K= 15/9= 5/3.
The scale factor is k= 5/3