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There can be 4 different acute angles in an irregular 4 sided quadrilateral that all add up to 360 degrees.
No, they do not.
Not normally
Answer: A regular quadrilateral is one with equal sides and equal angles, so it is a square. To negate this definition, we say an irregular quadrilateral is one where the sides are unequal or the angles are unequal OR BOTH. In simpler terms, we could say it is a quadrilateral which is not a square.
A kite or some irregular quadrilaterals.