No. A triangle can have a maximum of one obtuse angle.
yes
Yes. If an angle of x degree is obtuse then x > 180 deg Suppose x = 180 + y where y is positive. Then x can be divided into two angles of 90+y/2 degrees each y>0 so 90 + y/2 > 90 and so...
NO!
No because each of the 4 interior angles are right angles