Answer:
Step-by-step explanation:
Alright, lets get started.
The area of octagon is given 
The formula for area of octagon with side a is = 

hence ,



Hence the length of the side of the octagon is 46 : Answer
Now perimeter of the octagon will be = 
Hence the perimeter = 
hence the perimeter of the octagon is 371 : Answer
Hope it will help :)