Question

What is the scale factor?

Answer 1

Explanation:

it means that every line of figure A is multiplied by the same factor f to get the cheapskate side of figure B.

so,

12 × f = 4

f = 4/12 = 1/3

to check

10.5 × 1/3 = 3.5

correct

so,

the scale factor is 1/3.