If only one pair of opposite sides is required to be parallel, the shape is a trapezoid. Three examples are shown below. Special Quadrilaterals. (2) SquareA square is a regular quadrilateral. Not all polygons are quadrilaterals. That is an interesting property of regular polygons, and of parallel sides. A parallelogram has two parallel pairs of opposite sides. A. Oh Yes! A rectangle has two pairs of opposite sides parallel, and four right angles. A scalene quadrilateral is a four-sided polygon that has no congruent 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. But all quadrilaterals are polygons. 2) The two equal anglesare the base angles of the trapezoid, and mean that it is an isosceles trapezoid. (This definition excludes rhombi. A quadrilateral with two pairs of parallel sides, opposite sides are congruent, opposite angles are congruent, consecutive angles are supplementary, if it has … A regular dodecagon (12 sides) will have six pairs of parallel sides , but a regular tridecagon (13 sides) will have no parallel sides. 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. A quadrilateral is a polygon. All quadrilaterals are polygons with two pairs of parallel sides - False. 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. Complex Quadrilaterals. The regular polygon will have half as many pairs of parallel sides as it has sides (because two sides make a pair). B. 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. In the US this is a this is a trapezoid, but the British call it a trapezium. The opposite or facing sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are equal. (1) Parallelogram A parallelogram is a quadrilateral with two sets of parallel sides. C. A kite is a quadrilateral with exactly two pairs of adjacent congruent sides. An isosceles trapezoid is truncated isosceles triangle. Quadrilateral: A quadrilateral is defined as the geometrical figure having four sides and four vertices. A quadrilateral with two sets of parallel sides and four right angles is a _____. The definition of trapezoid is a quadrilateral with at least two parallel sides. 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