Answer:
Scale factor = 3.5
Step-by-step explanation:
Be handy to know what the line from the left is pointing at.
All you can do is guess. The length of the side starting at the point closest to the letter A is about 2 cm when using the magnifying glass.
The corresponding line on B is about 7 cm.
The scale factor is about 7/2 = 3.5
