A closed figures is one that has one consistent line making up the figure. There are no openings in the like. Example: a spiral.
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a figure, esp. a closed plane figure, having three or more, usually straight, sides.
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Starting with the definition of polygon makes much easier to understand why triangle is a polygon.Definition: A polygon is a closed figure bounded by sides.Definition of triangle: Triangle is a closed figure bounded by three sides.Since triangle is also a closed figure bounded by sides therefore, triangle is a polygon.
Yes they are. The definition of a quadrilateral is a closed figure with four sides. A square always has four congruent sides and is a closed figure. Therefore, all squares are quadrilaterals. Trapezoids, rhombuses, and rectangles are also quadrilaterals.
a closed, flat figure is a polygon. But it is only a polygon when it is not round.