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9 obvious, 3 for each row, 3 for each column, 4 for each rectangle of 4 squares, all of the squares. So 19
Draw diagonal lines to form a diagonal cross in each square, so dividing all the squares into four triangles in each. A pencil and a straightedge is all that is needed, no measuring to form vertical and horizontal lines to divide each square into four smaller squares is required. Can't show a photo or graphics in Answers, I believe.
Squares always have 4 interior angles which each measure 90°; rhombuses do not.
There are 28 squares because each square has 4 sides and so multiply 4x7=28
Yes