A circle, ellipse, and also a triangle, pentagon, hexagon etc - in fact all polygons other than quadrilaterals.
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a quadrilateral
If it has only 4 sides in total, then it's a parallelogram.I think any figure with more than 4 sides can have two sets of parallel sides.
quadrilateral
Rectangle.
A square is a rectangle with 4 equal sides and 4 equal angles. A rhombus is a parallelogram with 4 equal sides.