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  2. Decagon - Wikipedia

    en.wikipedia.org/wiki/Decagon

    A regular decagon has all sides of equal length and each internal angle will always be equal to 144°. [1] Its Schläfli symbol is {10} [ 2 ] and can also be constructed as a truncated pentagon , t{5}, a quasiregular decagon alternating two types of edges.

  3. 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.

  4. List of two-dimensional geometric shapes - Wikipedia

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

    Pentagon – 5 sides; Hexagon – 6 sides Lemoine hexagon; Heptagon – 7 sides; Octagon – 8 sides; Nonagon – 9 sides; Decagon – 10 sides; Hendecagon – 11 sides; Dodecagon – 12 sides; Tridecagon – 13 sides; Tetradecagon – 14 sides; Pentadecagon – 15 sides; Hexadecagon – 16 sides; Heptadecagon – 17 sides; Octadecagon – 18 ...

  5. Rhombicosidodecahedron - Wikipedia

    en.wikipedia.org/wiki/Rhombicosidodecahedron

    Dihedral angle: 3-4: 159°05′41″ (159.09°) 4-5: 148°16′57″ (148.28°) ... (each lune featuring two triangles adjacent to opposite sides of one square), can ...

  6. Dodecagon - Wikipedia

    en.wikipedia.org/wiki/Dodecagon

    Three squares of sides R can be cut and rearranged into a dodecagon of circumradius R, yielding a proof without words that its area is 3R 2. A regular dodecagon is a figure with sides of the same length and internal angles of the same size. It has twelve lines of reflective symmetry and rotational symmetry of order 12.

  7. Icosidodecahedron - Wikipedia

    en.wikipedia.org/wiki/Icosidodecahedron

    The dihedral angle of an icosidodecahedron between pentagon-to-triangle is ⁡ (+), determined by calculating the angle of a pentagonal rotunda. [ 4 ] An icosidodecahedron has icosahedral symmetry , and its first stellation is the compound of a dodecahedron and its dual icosahedron , with the vertices of the icosidodecahedron located at the ...

  8. 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.

  9. Icositetragon - Wikipedia

    en.wikipedia.org/wiki/Icositetragon

    In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi. ... {24/6}=6{4} Interior angle: 165° 150 ...