4, making it a rectangle or a square. If you don't want either of those, then 2.
Can't have 3 because interior angles total 360o.
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A quadrilateral can have four right angles.
2
one
no
No because a quadrilateral has 4 sides but doesn't have to have right angles. For example the. Trapezoid doesn't,t have right angles but it is a quadrilateral