Answer:
The scale factor is 4
Explanation:
This question requires an attachment; I'll answer this question using the attached figure
From the attachment
Length OA = 3 units
Length OA' = 3 units + 9 units
Length OA' = 12 units
Scale Factor is calculated as follows;
Given that the original shape is ABC, the original side will be OA
Hence, Original Side = 3 units
New Side = OA' = 12 units
The formula becomes
Hence, the scale factor is 4