A trapezoid has 1 set of parallel lines
well... i hav no idea!
A "Math Trapazoid" is a shape that has 4 sides. There is 1 long side on the bottom, 1 medium sized side on the top, and 2 equal slanted sides on the sides of the shape.
An isosceles triangle has two equal sides and one different side.
triangle.
A shape cannot have only one side because it would not be closed. A shape must have at least three sides to be a closed figure (no "gaps")
A square
No shape has only 1 parallel side. A trapezoid is a 4-sided shape, or quadrilateral, with only 2 parallel sides; it does not necessarily have to have 2 right angles. (In the UK a trapezoid is called a trapezium.) In North America, a trapezium is a quadrilateral with 0 (no) parallel sides.
A circle. One side, zero angles. Also a line as it is a 1-dimensional shape.
It could be a square based pyramid
A cylinder seems to fit the description
A circle. But you can also think of a circle as having an infinite number of sides as well.