They are either kites or (if the diagonals bisect each other) rhombuses.
Squares
All apart from square, rhombus, kite and arrowhead.
Oh, dude, no way! Diagonals of a trapezium definitely don't cross at right angles. They're like rebels, crossing all nonchalantly at different angles, not conforming to any right angle rules. It's like they're saying, "We're diagonals, we do what we want!"
yes 9
A square, a rhombus and a kite are three examples of quadrilaterals that have perpendicular diagonals that intersect each other at right angles.
wxyz
The diagonals of a rectangle do not cross at right angles
The diagonals of a square and a rhombus cross at right angles.
Squares
Square and Rhombus
Rhombus and square are the only quadrilaterals whose diagonals bisect the angles of the quadrilateral. In both these quadrilaterals, the diagonals intersect at right angles, dividing each angle into two equal parts.
kite,square and rhombus
rectangle
No.
No.
They are a square, a rhombus and a kite.
Most quadrilaterals will satisfy that requirement. Those that do (squares and kites) are the exception.