Answer:
The scale factor is 1/4
Explanation:
The length of the legs, PQ and PR are 4 units.
The lengths of the legs, P'Q' and P'R' are 1 unit.
Since the legs (and triangle) got smaller we know that the scale factor is between 0 and 1.
So.. 4 * x = 1
divide both sides by 4
x = 1/4
Hope this helps!