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  2. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    and each exterior angle (i.e., supplementary to the interior angle) has a measure of degrees, with the sum of the exterior angles equal to 360 degrees or 2π radians or one full turn. As n approaches infinity, the internal angle approaches 180 degrees.

  3. 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 ...

  4. Tridecagon - Wikipedia

    en.wikipedia.org/wiki/Tridecagon

    The measure of each internal angle of a regular tridecagon is approximately 152.308 degrees, and the area with side length a is given by = ⁡. ...

  5. Polygon - Wikipedia

    en.wikipedia.org/wiki/Polygon

    Each corner has several angles. The two most important ones are: 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 ...

  6. Decagon - Wikipedia

    en.wikipedia.org/wiki/Decagon

    The highest symmetry irregular decagons are d10, an isogonal decagon constructed by five mirrors which can alternate long and short edges, and p10, an isotoxal decagon, constructed with equal edge lengths, but vertices alternating two different internal angles. These two forms are duals of each other and have half the symmetry order of the ...

  7. Icositetragon - Wikipedia

    en.wikipedia.org/wiki/Icositetragon

    One interior angle in a regular icositetragon is 165°, meaning that one exterior angle would be 15°.. The area of a regular icositetragon is: (with t = edge length) = ⁡ = (+ + +).

  8. Icosagon - Wikipedia

    en.wikipedia.org/wiki/Icosagon

    The regular icosagon has Schläfli symbol {20}, and can also be constructed as a truncated decagon, t{10}, or a twice-truncated pentagon, tt{5}.. One interior angle in a regular icosagon is 162°, meaning that one exterior angle would be 18°.

  9. Hexadecagon - Wikipedia

    en.wikipedia.org/wiki/Hexadecagon

    Each angle of a regular hexadecagon is 157.5 degrees, and the total angle measure of any hexadecagon is 2520 degrees. ... Interior angle