Answer:
E. 4 cm
Explanation:
Given:
Scale factor (R) =

AB = 12 cm
Required:
Length of A'B'
SOLUTION:
A'B' = length of the image = x cm
AB = length of the preimage = 12 cm
Thus, using the scale factor given, the length can be calculated as shown below:


Multiply both sides by 12



x = A'B' = 4 cm