They are either kites or (if the diagonals bisect each other) rhombuses.
A rectangle has 2 pairs of parallel sides and its diagonals are of equal length but do not cross each other at 90 degrees
A rectangle would fit the given description
The diagonals do not intersect (cross) at 90 degrees.
Because it has 4 sides of equal lengths and its diagonals cross at 90 degrees. It looks like a tilted square with opposite parallel sides
yes, they do. though they are not always equal in length they always cross at right angles.
The cross section of cylinder along its length (parallel to the axis of symmetry has the shape of a rectangle.
The diagonals of a rectangle do not cross at right angles
The diagonals of a square and a rhombus cross at right angles.