Is it possible to have a quadrilateral with 3 obtuse angles?

yes , u can construct a quadrilateral with three obtuse angles as long as these three angles are less that 120, u can have three angles of 100 each and third angle will be 60 , as long as sum of three angles is less than 360

Yes. No, because if you make 3 angels over 90 you can't connect the figure... you would need 5 segments... but then it would be an irregular pentagon. No. It isn't possible. But don't take my Word for it I'm only in Pre Algerba