Any even sided irregular polygon can have opposite sides parallel. A parallelogram would be the simplest of these.
Parallelogram
a square
The shape has to be a parallelogram since it has no lines of symmetry and all sides are equal and parallel
A triangle
Parrallelogram (it has rotational symmetry but no lines of symmetry)
a trapezoid has a pair of symmetry lines but a square diamond or parallelogram all sides are parallel
a square...........regtangle............i hope this helps :)
Pentagon
a shape where if the opposite lines keep going they never touch.
The only known shapes with two lines of symmetry are rhombus and rectangles. These shapes are found by the test of line of symmetry of certain shapes.Sketch a rectangle, which has two pair of congruent and parallel lines and all right angles. Indicate the lines of symmetry. They should pass through each opposite midpoint of the segments of the rectangles.Sketch a rhombus, the shape that has all congruent sides, but have two pairs of congruent angles, which are different from another. Indicate the lines of symmetry. They should pass through both opposite vertices of the rhombus.
A rectangle.
It is a trapezoid that has one set of opposite parallel lines of different lengths.