1) The two parallel sides of different legths and constitute the bases of a trapezoid. 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. B. 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 parallelogram has two parallel pairs of opposite sides. Which quadrilateral has only 2 parallel sides? A quadrilateral with two sets of parallel sides and four right angles is a _____. (1) Parallelogram A parallelogram is a quadrilateral with two sets of parallel sides. Quadrilateral: A quadrilateral is defined as the geometrical figure having four sides and four vertices. A quadrilateral is a polygon. A quadrilateral is a four-sided polygon with four angles like- parallelogram, rectangle, square, trapezoid, rhombus. (2) SquareA square is a regular quadrilateral. Oh Yes! 2) The two equal anglesare the base angles of the trapezoid, and mean that it is an isosceles trapezoid. A quadrilateral with two pairs of parallel sides, opposite sides are congruent, opposite angles are congruent, consecutive angles are supplementary, if it has … (This definition excludes rhombi. But all quadrilaterals are polygons. All quadrilaterals are polygons with four sides - True. If only one pair of opposite sides is required to be parallel, the shape is a trapezoid. A rectangle has two pairs of opposite sides parallel, and four right angles. 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. An isosceles trapezoid is truncated isosceles triangle. Three examples are shown below. The definition of trapezoid is a quadrilateral with at least two parallel sides. 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. C. Some textbooks say a kite has at least two pairs of adjacent congruent sides, so a rhombus is a special case of a kite.) Special Quadrilaterals. 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. In the US this is a this is a trapezoid, but the British call it a trapezium. A scalene quadrilateral is a four-sided polygon that has no congruent sides. All quadrilaterals are polygons with two pairs of parallel sides - False. That is an interesting property of regular polygons, and of parallel sides. 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