Final answer:
The area of polygon b is 25 times larger than the area of polygon a.
Step-by-step explanation:
The area of polygon b is 25 times larger than the area of polygon a.
To find the ratio of the areas, we need to square the scale factor. Since the scale factor is 5, we square 5 to get 25. Therefore, the area of polygon b is 25 times larger than the area of polygon a.