the table shown is a relation between the side lengths of a regular octagon and its perimeter
so, the easiest way to find the ratio is.
Step 1
divide the perimeter by the length of the side
so, the factor is 8, it means that you need take the length and multiply by 8 to obtain the perimeter
Step 2
find the misssing values
so, the numbers in the table must be 72 and 96.