How many different squares can be traced?

Each of the boxes in the figure at the right is a square. How many different squares can be traced using the lines in the figure?


Number of 1x1 squares that can be traced = Number of squares in the figure = 21
Number of 2x2 squares that can be traced = 12
Number of 3x3 squares that can be traced = 5

Total number of squares = 21+12+5= 38

38 different squares can be traced using the lines in the figure.