What is the smallest number of shaded squares that must be added, so that the line MN becomes a line of symmetry?
(a) 11
(b) 12
(c) 13
(d) 10
What is the smallest number of shaded squares that must be added, so that the line MN becomes a line of symmetry?
(a) 11
(b) 12
(c) 13
(d) 10