Q: Is a right triangle a closed figure?

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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.

Triangle

A triangle.

A polygon.

A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.

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yes, a triangle is a closed figure

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.

A polygon is a closed figure bounded by sides. A triangle is a closed figure bounded by three sides. Therefore, according to the definition of polygon triangle is a polygon.

Yes, the definition of a polygon is any closed figure with straight sides.

yes

no.

If the start and end points of a figure are same, then it is called a closed figure. Examples can be a square or a triangle or a pentagon.

Triangle

A triangle.

A three sided closed plane figure (shape) is a triangle.

Yes by 3 lines

A polygon.