They don't need to have parallel lines or right angles. If you think about that, it means that a triangle is a polygon. So are squares, rectangles and, yes, quadrilaterals, parallelograms and trapezoids. They all are closed shapes with many sides, so they're all polygons!

Is a trapezium is a polygon?

The trapezium is a four-sided polygon and a two-dimensional figure which has exactly one pair of parallel sides opposite to each other. A trapezoid is also a four-sided polygon and with one pair of parallel sides opposite to each other.

Is a trapezoid a 4 sided polygon?

Trapezoids have only one pair of parallel sides; parallelograms have two pairs of parallel sides. A trapezoid can never be a parallelogram. ... Trapezoids are four-sided polygons, so they are all quadrilaterals.