"He doesn't have no sisters", has to negatives, which is called a double negative. To avoid using double negatives, don't use two of the following words together.
Never, no, no one, none, not ( and its contraction n't ), and nothing are common negatives.
The correct sentence is "He has no sisters", or "He doesn't have any sisters".
Perimeter is when you add all of the sides together. To solve this problem, you would double 60 because their are 2 sides of the length. Then you would subtract 222 and 120 to get 102. Then you would divide that by 2 to get 51mm as the answer for the width.