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  2. Coinage shapes - Wikipedia

    en.wikipedia.org/wiki/Coinage_shapes

    They have also been struck with scalloped (wavy) edges, and with holes in the middle. Coins in the shape of polygons often have rounded edges or are Reuleaux polygons . This article focuses mainly on circulating coins; a number of non-circulating commemorative coins have been made in special shapes, including guitars, pyramids, and maps. [ 1 ]

  3. Polygon with holes - Wikipedia

    en.wikipedia.org/wiki/Polygon_with_holes

    In geometry, a polygon with holes is an area-connected planar polygon with one external boundary and one or more interior boundaries (holes). [1] Polygons with holes can be dissected into multiple polygons by adding new edges, so they are not frequently needed. An ordinary polygon can be called simply-connected, while a polygon-with-holes is ...

  4. Hendecagon - Wikipedia

    en.wikipedia.org/wiki/Hendecagon

    In geometry, a hendecagon (also undecagon [1] [2] or endecagon [3]) or 11-gon is an eleven-sided polygon. (The name hendecagon , from Greek hendeka "eleven" and –gon "corner", is often preferred to the hybrid undecagon , whose first part is formed from Latin undecim "eleven".

  5. Rhombicosidodecahedron - Wikipedia

    en.wikipedia.org/wiki/Rhombicosidodecahedron

    In geometry, the Rhombicosidodecahedron is an Archimedean solid, one of thirteen convex isogonal nonprismatic solids constructed of two or more types of regular polygon faces. It has a total of 62 faces: 20 regular triangular faces, 30 square faces, 12 regular pentagonal faces, with 60 vertices , and 120 edges .

  6. 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.

  7. This is the surprising reason your pen caps have holes in them

    www.aol.com/news/2016-05-09-did-you-know-the...

    According to the Independent, the idea was conjured up by the French company, Bic, who added the holes to prevent people from choking to death if they were to accidentally swallow one.

  8. Roman dodecahedron - Wikipedia

    en.wikipedia.org/wiki/Roman_dodecahedron

    A Roman dodecahedron or Gallo-Roman dodecahedron [1] [2] is a small hollow object made of copper alloy which has been cast into a regular dodecahedral shape with twelve flat pentagonal faces. Each face has a circular hole of varying diameter in the middle, the holes connecting to the hollow center, and each corner has a protruding knob. [1]

  9. There's a reason your spaghetti spoon has a hole

    www.aol.com/lifestyle/2016-06-29-theres-a-reason...

    The round circle in the middle of the pasta server is there so you can determine the right serving size. ... 5 chicken pastas to memorize for weeknights. By filling the hole with uncooked noodles ...