There are 2, according to the formula, diagonals of a shape = n(n-3)/2 where n is number of sides.
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Any quadrilateral (4-sided shape) has 2 diagonals.
A 4 sided quadrilateral has 2 diagonals.
a square
It has 2 diagonals in common with all other 4 sided quadrilaterals
7-3 = 4