Question

Quadrilateral qrst has diagonals that are perpendicular but not congruent. which type of quadrilateral could describe quadrilateral qrst? square rhombus isosceles trapezoid rectangle

Answer 1

A quadrilateral that has unequal diagonals that meet at right angles could be a kite or a rhombus.  A scalene quadrilateral MIGHT have diagonals meeting at right angles but usually not.  (see attached graphic.)

Source:
http://www.1728.org/quadltrl.htm