It could be a kite or a right trapezium.
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yes!! a square! a squares angles are all 90 degrees. and a quadrilateral with 2 90 degree angles, and 1 with 40 one with 50. very possible.
A rectangle.
The definition of a rectangle is a quadrilateral with four 90 degree angles, which is not always a square. The definition of a square is a quadrilateral with four 90 degree angles and all sides congruent, which is always a rectangle.
A quadrilateral is not necessarily a rectangle. The only time this is not true is in the case of a square on a quadrilateral without four 90 degree angles.
Two lines are perpendicular if they cross at 90 degree angles.