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  2. List of polygons - Wikipedia

    en.wikipedia.org/wiki/List_of_polygons

    In geometry, a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain. These segments are called its edges or sides , and the points where two of the edges meet are the polygon's vertices (singular: vertex) or corners .

  3. List of two-dimensional geometric shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_two-dimensional...

    This is a list of two-dimensional geometric shapes in Euclidean and other geometries. ... Digon – 2 sides; Triangle – 3 sides ... By using this site, ...

  4. Polygon - Wikipedia

    en.wikipedia.org/wiki/Polygon

    In geometry, a polygon (/ ˈ p ɒ l ɪ ɡ ɒ n /) is a plane figure made up of line segments connected to form a closed polygonal chain. The segments of a closed polygonal chain are called its edges or sides. The points where two edges meet are the polygon's vertices or corners. An n-gon is a polygon with n sides; for example, a triangle is a 3 ...

  5. Congruence (geometry) - Wikipedia

    en.wikipedia.org/wiki/Congruence_(geometry)

    The shape of a triangle is determined up to congruence by specifying two sides and the angle between them (SAS), two angles and the side between them (ASA) or two angles and a corresponding adjacent side (AAS). Specifying two sides and an adjacent angle (SSA), however, can yield two distinct possible triangles.

  6. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    A curvilinear triangle is a shape with three curved sides, for instance, a circular triangle with circular-arc sides. (This article is about straight-sided triangles in Euclidean geometry, except where otherwise noted.) Triangles are classified into different types based on their angles and the lengths of their sides.

  7. Extended side - Wikipedia

    en.wikipedia.org/wiki/Extended_side

    Each of a triangle's excircles (orange) is tangent to one of the triangle's sides and to the other two extended sides. In plane geometry, an extended side or sideline of a polygon is the line that contains one side of the polygon. The extension of a finite side (a line segment) into an infinite line arises in various contexts.