It could be any irregular polygon with 4 or more sides (and 4 or more angles).
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parallelogram
They make a pair of acute angles and a pair of obtuse angles. In rotational order, the angles are acute, obtuse, acute, obtuse.
A trapezoid contains either:two acute angles and two obtuse angles orone acute angle, one obtuse angle and two right angles.
It can be called obtuse, scalene ( if two acute angles are different ), or isosceles ( if two acute angles are the same ).
Not necessarily. The definition for a rhombus is a polygon with four sides of equal length. Therefore, a square is a rhombus. However, any rhombus not as square does have two same sized acute and obtuse angles.