no, for example a rhombus
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It depends - Quadrilaterals such as Squares are regular. Others, like the rectangle or other 'wierd' or irregular shapes aern't... Since regular polygons have, by definition, congruent sides and congruent angles, the only quadrilaterals that would be regular are squares. Rectangles have 4 congruent angles, but their sides are not all congruent, so it wouldn't count. Similarly, the only regular triangles would be equilateral triangles, since they are the only ones with all sides and all angles congruent.
They are 4 sided quadrilaterals and have 4 right angles with a pair of opposite parallel sides but it is not a square.
All quadrilaterals have four angles
Yes, all Quadrilaterals have four sides, therefore they must have 4 angles.
All 4 sided quadrilaterals have 4 interior angles that add up to 360 degrees