trapezoid
trapezoids
It is impossible. You must have at least two sides which are parallel to one another.
Put 2 lines on the perpendicular sides and put 1 line for the parallel sides
All regular polygons with an even number of sides. Irregular polygons with an odd number of sides can have parallel sides. There are also non polygonal shapes that can have parallel sides.
Infinitely many. Every regular polygon with 2n sides has n pairs of parallel sides. Then there are irregular polygons which can have parallel sides. And there are also irregular shapes which have parallel sides.
You need at least one pair of parallel sides. Most trapezoids have that.
A trapezoid and an isosceles trapezoid
A shape with four or more sides can have two parallel sides.
There are no parallel sides on a nonagon (nine-sided figure)... Regular shapes with an odd-number of sides have no parallel sides.
Shapes with two or more pairs of parallel sides include rectangles, parallelograms, and rhombuses. In these quadrilaterals, opposite sides are parallel, which gives them distinct geometric properties. Additionally, trapezoids can have one pair of parallel sides, while some complex polygons can have multiple pairs of parallel sides. Overall, shapes with parallel sides are commonly found in both regular and irregular polygons.
Circles
Well If you are looking for a four sided shape with no parallel sides it is called a trapezium.