if a figure is a square, then it is a regular quadrilateral
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It would be impossible. A trapezoid can't have three right angles. It would just make a rectangle.
you cant because it would be a square
No you cant
Not possible - that would mean the final angle would also have to be ninety degrees - making it a square or rectangle.
It could be a 4 sided trapezoid having 2 right angles on one side wth an acute and obtuse angle on the other side. The 4 interior angles must add up to 360 degrees.