A regular octagon has 8 interior obtuse angles.
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It has two obtuse angles
A trapezium has one or two obtuse angles.
An obtuse triangle can have no right angles, and has two equal 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.