parallelogram rhombus rectangle square A quadrilateral with only one pair of parallel sides … C. The opposite or facing sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are equal. Not all polygons are quadrilaterals. Some textbooks say a kite has at least two pairs of adjacent congruent sides, so a rhombus is a special case of a kite.) 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. An isosceles trapezoid is truncated isosceles triangle. (1) Parallelogram A parallelogram is a quadrilateral with two sets of parallel sides. B. 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. A scalene quadrilateral is a four-sided polygon that has no congruent sides. The definition of trapezoid is a quadrilateral with at least two parallel sides. A rectangle has two pairs of opposite sides parallel, and four right angles. All quadrilaterals are polygons with two pairs of parallel sides - False. Three examples are shown below. (2) SquareA square is a regular quadrilateral. Quadrilateral: A quadrilateral is defined as the geometrical figure having four sides and four vertices. In word problems, be careful not to assume that a quadrilateral has parallel sides or equal sides unless that is stated. Which quadrilateral has only 2 parallel sides? A quadrilateral is a four-sided polygon with four angles like- parallelogram, rectangle, square, trapezoid, rhombus. Polygon. A quadrilateral is a polygon. Complex Quadrilaterals. In the US this is a this is a trapezoid, but the British call it a trapezium. A kite is a quadrilateral with exactly two pairs of adjacent congruent sides. All quadrilaterals are polygons with four sides - True. But all quadrilaterals are polygons. 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. A quadrilateral with two pairs of parallel sides, opposite sides are congruent, opposite angles are congruent, consecutive angles are supplementary, if it has … If only one pair of opposite sides is required to be parallel, the shape is a trapezoid. A parallelogram has two parallel pairs of opposite sides. Special Quadrilaterals. (This definition excludes rhombi. 2) The two equal anglesare the base angles of the trapezoid, and mean that it is an isosceles trapezoid. That is an interesting property of regular polygons, and of parallel sides. A. 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). 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