(i) The given points are A(3, 2), B(0, 5), C(−3, 2) and D(0, −1).
Therefore, the given points form a square.
(ii) The given points are A(6, 2), B(2, 1), C(1, 5) and D(5, 6).
Therefore, the given points form a square.
(iii) The given points are P(0, −2), Q(3, 1), R(0, 4) and S(−3, 1).
Therefore, the given points form a square.