A polygon with four or more sides can meet these requirement.
shape no pairs of perpendicular sides
a Kite
a cross
Square
The perpendicular adjacent sides in the triangle would be 3 sides. It is the basically horizonstal line next to a vertical line(perpendicular) if it was parallel adjacent then only two side of triangle /\ <-- parallel
trapazoid
shape no pairs of perpendicular sides
trapezoid
square
It could be a right angle triangle
a Kite
parallelogram
No anwser impossible
A hexagon.
Hexagon.
For a shape to have parallel sides it needs at least 4 sides
a cross