A trapezoid has four sides. It is a simple, convex quadrilateral with at least one pair of parallel sides. In British English, it is typically called a trapezium.
Formerly, the word trapezoid in British English meant a quadrilateral with no parallel sides, or what is often called an irregular quadrilateral.
Agreement as to the classification of trapezoids is not universal. Some regard only quadrilaterals with one single pair of parallel sides as trapezoids. Others regard the parallelogram, with two pairs of parallel sides, as a special type of trapezoid. This definition includes rectangles, rhombuses and squares as trapezoids as well because they are all special types of parallelogram.
Learn MoreA trapezoid is a four-sided shape that has four interior angles. All quadrilaterals are defined by having four sides, four corners and four angles.
Full Answer >An n-gon is a polygon with "n" sides, where "n" is a placeholder for any number. The letter "n" is commonly used alongside other letters in mathematics and science as variables to represent unknown numbers.
Full Answer >Based on the geometric definition of a polygon, a circle has no sides or infinite sides. According to the definition, a circle cannot have sides because it isn't made up of line segments that are connected by shared endpoints that form interior angles.
Full Answer >A trapezoid is a quadrilateral with two parallel sides and, usually, two nonparallel sides. A quadrilateral is a geometric shape that has four sides. Some specialized types of trapezoid are the parallelogram and the isosceles trapezoid.
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