I think this person means the trapazoid. It has only one pair of parallel sides.
Sometimes. One side can be perpendicular to the two parallel sides, but doesn't have to be.
If both pairs of opposite sides are parallel: A Rectangle, or a Square. If exactly one pair of opposite sides are parallel: An Isosceles Trapezoid. If it does not have parallel sides and one diagonal is the perpendicular bisector of the other: A Kite It is also possible that it does not have any parallel sides and neither diagonal is the perpendicular bisector of the other: A quadrilateral
trapezium
An irregular hexagon.
[object Object]
trapazoid
trapezoid
It fits the description of a right angle triangle
Sometimes. One side can be perpendicular to the two parallel sides, but doesn't have to be.
The rungs are perpendicular to both sides
A geometric shape with only one set of parallel sides is a trapezoid.
right triangle
A quadrilateral in the shape of a kite has no parallel sides
It is a closed four-sided shape with one pair of parallel sides, joined at only one end by a line which is perpendicular to both.
There are infinitely many polygons which have this property. The easiest to think of is a right triangle. But there are also quadrilaterals, pentagons, etc., that can be constructed that have this property.
Any shape wit four of more sides can have one pair of parallel sides.
A trapezium. It has one set of parallel sides. It has four sides.