If only one pair of opposite sides is required to be parallel, the shape is a trapezoid. In fact it is a 4-sided polygon, just like a triangle is a 3-sided polygon, a pentagon is a 5-sided polygon, and so on. That is an interesting property of regular polygons, and of parallel sides. In the US this is a this is a trapezoid, but the British call it a trapezium. (This definition excludes rhombi. parallelogram rhombus rectangle square A quadrilateral with only one pair of parallel sides … C. A kite is a quadrilateral with exactly two pairs of adjacent congruent sides. Three examples are shown below. A regular dodecagon (12 sides) will have six pairs of parallel sides , but a regular tridecagon (13 sides) will have no parallel sides. The regular polygon will have half as many pairs of parallel sides as it has sides (because two sides make a pair). The definition of trapezoid is a quadrilateral with at least two parallel sides. A scalene quadrilateral is a four-sided polygon that has no congruent sides. An isosceles trapezoid is truncated isosceles triangle. In word problems, be careful not to assume that a quadrilateral has parallel sides or equal sides unless that is stated. (1) Parallelogram A parallelogram is a quadrilateral with two sets of parallel sides. Not all polygons are quadrilaterals. Polygon. If the shape (a quadrilateral) has only 2 parallel sides, it is a trapezoid (UK trapezium).A shape with four sides and two sets of parallel sides is a parallelogram (rectangle, square, rhomboid, rhombus) because these figures have four sides and two sets of parallel sides. The opposite or facing sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are equal. All quadrilaterals are polygons with four sides - True. Some textbooks say a kite has at least two pairs of adjacent congruent sides, so a rhombus is a special case of a kite.) A parallelogram has two parallel pairs of opposite sides. B. Quadrilateral: A quadrilateral is defined as the geometrical figure having four sides and four vertices. All quadrilaterals are polygons with two pairs of parallel sides - False. A quadrilateral is a four-sided polygon with four angles like- parallelogram, rectangle, square, trapezoid, rhombus. But all quadrilaterals are polygons. A. A quadrilateral is a polygon. Which quadrilateral has only 2 parallel sides? Special Quadrilaterals. Oh Yes! when two sides cross over, we call it a "Complex" or "Self-Intersecting" quadrilateral, like these: They still have 4 sides, but two sides cross over. 1) The two parallel sides of different legths and constitute the bases of a trapezoid. Complex Quadrilaterals. (2) SquareA square is a regular quadrilateral. 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