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.
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A concave irregular hexagon can have up to 6 right angles. A convex irregular hexagon can have up to 3 right angles.
A regular hexagon doesn't have right angles, though irregular hexagons may have as many as six right angles.
An Irregular hexagon looks like anything that has no bended angles/sides. Also it only has 6 sides/angles.
None. Though there can be ten if the hexagons are concave hexagons.
If it is a regular hexagon, there should be no right angles within it.