It has: 0.5*(16squared-(3*16)) = 104 diagonals
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None but the diagonals intersect at 90 degrees
i think 4
The diagonals of every quadrilateral must intersect.
A square, a rhombus and a kite have diagonals that intersect each other at 90 degrees.
The 2 diagonals of a rhombus intersect at right angles