The all have 4 sides and their 4 interior angles add up to 360 degrees
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All quadrilaterals have 4 sides
No it is not true but all quadrilaterals have 4 sides. But a square has 4 lines of symmetry and 4 equal sides.
true
Yes, by definition, quadrilaterals are a type of polygone (specifically any that has exactly four sides).
No. This is only true of parallelograms.