Answer:
To find the scale factor between the two similar figures, we can use the ratio of their surface areas. Similar figures have the same shape but different sizes, so their surface areas will be in proportion to the scale factor.
We are given that the surface area of the first figure is 169 cm² and the surface area of the second figure is 121 cm².
The scale factor is the ratio of the surface area of the first figure to the surface area of the second figure.
The ratio can be found by dividing the surface area of the first figure by the surface area of the second figure:
169 cm² / 121 cm² = 13/9
So, the scale factor between the two similar figures is 13/9
Therefore, the answer is 13:9.