6.
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A regular six-sided hexagon has no interior acute angles, but it does have six interior obtuse angles, each measuring 120 degrees
As far as I know, a hexagon has 6 angles whether it is regular or not. Some may be obtuse angles, but they still count. So a hexagon where some of the sides go 'in' rather than 'out' is still a hexagon.
None. Though there can be ten if the hexagons are concave hexagons.
There are no angles they are all obtuse angles
A trapezium has 2 obtuse and 2 acute angles.