I am trying to put a fence around a garden that is in the shape of a regular hexagon. i know that the side of the garden is 6ft but i want walking room around the garden, so i will need extra fence. E

I am trying to put a fence around a garden that is in the shape of a regular hexagon. i know that the side of the garden is 6ft but i want walking room around the garden, so i will need extra fence. Each side of the fence will be 2 ft.longer than the side of the garden how many feet of fencing would i need in order to completely surround my garden