Three - in an arrowhead, for example.
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It is just an irregular quadrilateral.
No, a quadrilateral can't have three acute angles and one right angle. The angles of a quadrilateral must total 360. The three other angles of a quadrilateral with one right angle would then have to total 270 degrees. If all three were acute (less than 90 degrees), they could not total 270.
octegon
A kite can satisfy those criteria.
isolese triangle