None... All 4 angles are right angles (right angle means 90 degrees), meaning the angles are neither obtuse, nor acute.
It has two obtuse angles
A rhombus have 2 obtuse angles
There are no angles they are all obtuse angles
A trapezium has one or two obtuse angles.
There are 3 obtuse angles in a heptagon.
An obtuse triangle can have no right angles, and has two equal angles.
One and the two others are acute angles
A trapezium has 2 obtuse and 2 acute angles.
A regular octagon has 8 interior obtuse angles.
There are 3 obtuse angles. All 3 exterior angles are obtuse. (This is, admittedly, a bit of trick question!)
A triangle can have at most one obtuse angle, but triangles do not necessarily have any obtuse angles.
There can be 10 obtuse angles. If there are no reflex angles there can by up to three acute angles (I think).