To find the scale factor Leo used to enlarge the jewelry from the original size to the photograph, we can use the formula for scale factor:
\[ \text{Scale Factor} = \frac{\text{New Size}}{\text{Original Size}} \]
In this case, the original size of each side of the pentagon is 3 centimeters, and the new size is 8 centimeters.
Calculating the scale factor:
\[ \text{Scale Factor} = \frac{8 \text{ cm}}{3 \text{ cm}} = \frac{8}{3} \]
So the scale factor that Leo used is:
\(\frac{8}{3}\)
Therefore, the correct response is:
213 (since the fraction \(\frac{8}{3}\) corresponds to 2 and 1/3).