The table below shows the relationship between the side lengths of a regular octagon and its perimeter. (5 points)


Side Lengths, s (inches)

Perimeter, P (inches)

1

8

2

16

3

24

4

32

9



12



a: Complete the table. (2 points)





b: If Gabby wants to make an octagon with a side length of 20 inches using wire, how much wire does she need? Justify your reasoning with an explanation of whether perimeter is proportional to the side length. (3 points)