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2. Internal and external angles - Wikipedia

   en.wikipedia.org/wiki/Internal_and_external_angles

   The interior angle concept can be extended in a consistent way to crossed polygons such as star polygons by using the concept of directed angles.In general, the interior angle sum in degrees of any closed polygon, including crossed (self-intersecting) ones, is then given by 180(n–2k)°, where n is the number of vertices, and the strictly positive integer k is the number of total (360 ...

3. Polygon - Wikipedia

   en.wikipedia.org/wiki/Polygon

   A simple polygon is the boundary of a region of the plane that is called a solid polygon. The interior of a solid polygon is its body, also known as a polygonal region or polygonal area. In contexts where one is concerned only with simple and solid polygons, a polygon may refer only to a simple polygon or to a solid polygon.

4. List of polygons - Wikipedia

   en.wikipedia.org/wiki/List_of_polygons

   A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. 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.

5. Simple polygon - Wikipedia

   en.wikipedia.org/wiki/Simple_polygon

   Another important class of simple polygons are the star-shaped polygons, the polygons that have a point (interior or on their boundary) from which every point is visible. [ 2 ] A monotone polygon , with respect to a straight line L {\displaystyle L} , is a polygon for which every line perpendicular to L {\displaystyle L} intersects the interior ...

6. Rectilinear polygon - Wikipedia

   en.wikipedia.org/wiki/Rectilinear_polygon

   A rectilinear polygon is a polygon all of whose sides meet at right angles. Thus the interior angle at each vertex is either 90° or 270°. Rectilinear polygons are a special case of isothetic polygons. In many cases another definition is preferable: a rectilinear polygon is a polygon with sides parallel to the axes of Cartesian coordinates ...

7. Regular polygon - Wikipedia

   en.wikipedia.org/wiki/Regular_polygon

   Regular convex and star polygons with 3 to 12 vertices labelled with their Schläfli symbols. These properties apply to all regular polygons, whether convex or star: A regular n-sided polygon has rotational symmetry of order n. All vertices of a regular polygon lie on a common circle (the circumscribed circle); i.e