The scale factor of the ΔABC to the triangle ΔXYZ as evident in the task content is; 12/3 = 4.
It follows from the task content that the two triangles ΔABC and ΔXYZ are said to be similar triangles.
On this note, it can be concluded from the statement of similarity that the ratios of their corresponding side lengths must be in proportion.
Consequently, since side AC is labelled 12 and side XZ is labelled; 3, the scale factor from ΔABC to ΔXYZ is; 12/3 = 4.
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