The perimeter of a square is 28 . What is the side length of this square?
(A) 9
(B) 6
(C) 8
(D) 4
(E) 7
Since a square has four equal sides, the side length of a square equals one-quarter of the perimeter of the square.

Thus, the side length of a square with perimeter 28 is $28 \div 4=7$.

ANswer: (E)