It depends on the shape. A square has no diagonals.
Improved Answer:-
A square has 2 diagonals in common with all other quadrilaterals
The formila is: 0.5*(n2-3n) = diagonals whereas n in the formula represents the number of sides the polygon or shape has
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In most shapes the diagonals do not bisect one another. It might be possible to answer the question if it were more specific. To start with, shapes with how many sides?
All quadrilaterals (four sided shapes) have 2 diagonals.
not in all shapes.
your ball sack
squares and maybe a rhombus