The triangle on the right is a scaled copy of the triangle on the left. Identify the scale factor. Express your answer as a whole number or fraction in simplest form.

Answer:
SF = 3
Step-by-step explanation:
To find the scale factor, take the value of one side length from the scaled copy and divide it by the value of the corresponding side length of the original.
39/13 = 3
Therefore, the scale factor is 3.