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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. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    As n approaches infinity, the internal angle approaches 180 degrees. For a regular polygon with 10,000 sides (a myriagon) the internal angle is 179.964°. As the number of sides increases, the internal angle can come very close to 180°, and the shape of the polygon approaches that of a circle. However the polygon can never become a circle.

  4. Hexadecagon - Wikipedia

    en.wikipedia.org/wiki/Hexadecagon

    A regular hexadecagon is a hexadecagon in which all angles are equal and all sides are congruent. Its Schläfli symbol is {16} and can be constructed as a truncated octagon , t{8}, and a twice-truncated square tt{4}.

  5. Hexagon - Wikipedia

    en.wikipedia.org/wiki/Hexagon

    In geometry, a hexagon (from Greek ἕξ, hex, meaning "six", and γωνία, gonía, meaning "corner, angle") is a six-sided polygon. [1] The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.

  6. Dodecagon - Wikipedia

    en.wikipedia.org/wiki/Dodecagon

    The internal angle at each vertex of a regular dodecagon is 150°. ... A simple formula for area (given side length and span) is: ... The interior of such a dodecagon ...

  7. Polygon - Wikipedia

    en.wikipedia.org/wiki/Polygon

    Interior angle – The sum of the interior angles of a simple n-gon is (n − 2) × π radians or (n − 2) × 180 degrees. This is because any simple n-gon ( having n sides ) can be considered to be made up of (n − 2) triangles, each of which has an angle sum of π radians or 180 degrees.

  8. Decagon - Wikipedia

    en.wikipedia.org/wiki/Decagon

    The total sum of the interior angles of a simple decagon is 1440°. Regular decagon ... An alternative formula is = where d is the distance ...

  9. Concave polygon - Wikipedia

    en.wikipedia.org/wiki/Concave_polygon

    As with any simple polygon, the sum of the internal angles of a concave polygon is π ×(n − 2) radians, equivalently 180×(n − 2) degrees (°), where n is the number of sides. It is always possible to partition a concave polygon into a set of convex polygons.