If only one pair of opposite sides is required to be parallel, the shape is a trapezoid. Oh Yes! A rectangle has two pairs of opposite sides parallel, and four right angles. The regular polygon will have half as many pairs of parallel sides as it has sides (because two sides make a pair). In word problems, be careful not to assume that a quadrilateral has parallel sides or equal sides unless that is stated. Not all polygons are quadrilaterals. In the US this is a this is a trapezoid, but the British call it a trapezium. Complex Quadrilaterals. Quadrilateral: A quadrilateral is defined as the geometrical figure having four sides and four vertices. (1) Parallelogram A parallelogram is a quadrilateral with two sets of parallel sides. That is an interesting property of regular polygons, and of parallel sides. 1) The two parallel sides of different legths and constitute the bases of a trapezoid. The opposite or facing sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are equal. 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. Which quadrilateral has only 2 parallel sides? A regular dodecagon (12 sides) will have six pairs of parallel sides , but a regular tridecagon (13 sides) will have no parallel sides. The definition of trapezoid is a quadrilateral with at least two parallel sides. 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. Polygon. A parallelogram has two parallel pairs of opposite sides. B. An isosceles trapezoid is truncated isosceles triangle. A trapezoid, in which the non-parallel sides are equal in length, is called isosceles.A quadrilateral with two separate pairs of equal adjacent sides is commonly called a kite. 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 quadrilateral is a four-sided polygon with four angles like- parallelogram, rectangle, square, trapezoid, rhombus. C. A quadrilateral with two sets of parallel sides and four right angles is a _____. (2) SquareA square is a regular quadrilateral. All quadrilaterals are polygons with four sides - True. A kite is a quadrilateral with exactly two pairs of adjacent congruent sides. (This definition excludes rhombi. All quadrilaterals are polygons with two pairs of parallel sides - False. Three examples are shown below. But all quadrilaterals are polygons. A quadrilateral is a polygon. 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