Plot the following points and find out the area of enclosed figures.
(i) A (3 , 1), B (3 , 6), C (5 , 6), D (5 , 1)
(ii) A ( 2 , 4), B (5 , 4), C (5 , 4), D (2 , 4)
(iii) A (3 , 3), B (3 , 3), C (3 , 3), D (3 , 3)
(iv) O (0 , 0), A (0 , 7), B (7 , 7), C (7 , 0) (v) A (0 , 2), B (4 , 6), C (4 , 6)
(vi) A (1 , 2), B (9,2), C (7 , 4), D (3 , 4)
(vii) A (4, 1), B (4, 7), C (7, 10), D (7 , 4)