Only on a curved surface like a sphere. You must understand non-euclidean geometry (geometry with no flat surfaces like paper).
On a curved plane like a sphere all angles>180
On a flat plane like paper all angles=180
And on a saddle shaped plane like a Pringle all angles<180
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No an abtuse triangle can not have two obtuse angles
No it's not possible at all.
Yes. Every triangle with an obtuse angle must have two acute angles.
An obtuse triangle can have no right angles, and has two equal angles.
An obtuse triangle must have two acute angles and these can be congruent.