Quadrilaterals have four sides so the only possible answer to this question is that a quadrilateral only has two diagonals.
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All quadrilaterals have 2 diagonals.
A square, a rhombus and a kite are all 4 sided quadrilaterals that have perpendicular diagonals.
Rectangles
A square and a rectangle have diagonals of the same lengths.
rectangle and parallelogram