Adjacent sides intersect at vertices. Non-adjacent sides may be parallel and so may not intersect.
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Every polygon has two of its sides intersect.
No, A polygon is a closed geometric figure whose sides are nothing more than line segments. Each corner of a polygon where two sides intersect is called a vertex of the polygon.
An angle. A polygon is a plane figure bounded by straight sides (triangle, quadrilateral, pentagon, etc).
No, a crescent is not a polygon. It is the area between two arcs of different radii that intersect each other.Theoretically, the crescent could be considered to be a polygon with an infinite number of infinitesimally small sides, but that is not the standard interpretation.
A 20-sided polygon is called an icosagon. In geometry, a polygon with n sides has n vertices. Therefore, a 20-sided polygon would have 20 vertices. Each vertex represents a point where two sides of the polygon intersect.