An acute triangle.
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Any polygon can contain acute interior angles.
An acute polygon is one whose interior angles are all acute. Only a triangle can be an acute polygon.
A polygon, that is, a plane area bounded by any number (>2) of straight lines can have acute angles.
A regular pentagon has no acute angles. It is possible to draw a pentagon (five sided polygon) where four of the internal angles are acute.
It could be any irregular polygon with 4 or more sides (and 4 or more angles).