PLEASE HELP WITH THIS(INORDER FOR ME TO GIVE YOU A BRIANLIST, YOU MUST SHOW A PICTURE AND EXPLAIN HOW U GOT IT)(will give brainlist and thanks)(Find the premeter)

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)