A quadrilateral has 2 diagonals.
Yes, any quadrilateral has diagonals.
A Quadrilateral has two diagonals. IF the quadrilateral is a rectangle, then the two diagonals are equal in length.
If the diagonals of a quadrilateral are perpendicular to each other, then the quadrilateral is a square.Or a kite.
A quadrilateral has 2 diagonals. It does not matter whether it is convex or not.
A quadrilateral has two and only two diagonals. That's the maximum and also the minimum. If it has more or fewer than two diagonals, it's not a quadrilateral.
It has two diagonals
Sure, a square is a rectangle and the diagonals of a square are perpendicular.