Sorry all you answerers above. It MIGHT be a right trapezoid (or trapezium, as some countries call it. That is ONLY if the two right angles are adjacent. If they are NOT adjacent, then it must be merely a quadrilateral (it cannot be a kite, as then sides would pair for length). If you wish to assemble one, draw two non-congruent non-isoceles right triangles which share a common hypotense. The combined shape is your target!
-- Cheers, -- Mr. d.
Example on Cartesian plane: (0,0),(0,1), (1,2), (3,0)