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en.wikipedia.org/wiki/Dodecagon

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. A regular dodecagon is represented by the Schläfli symbol {12} and can be constructed as a truncated hexagon, t{6}, or a twice-truncated triangle, tt{3}. The ...

www.reference.com/math/12-sided-shape-called-1a60710ce1b50533

A 12-sided shape is called a dodecagon. A dodecagon is a type of polygon, which is a two-dimensional shape comprised of straight lines. These lines connect to each other to form a closed shape.

en.wikipedia.org/wiki/Dodecahedron

In geometry, a dodecahedron (Greek δωδεκάεδρον, from δώδεκα dōdeka "twelve" + ἕδρα hédra "base", "seat" or "face") is any polyhedron with twelve flat faces. The most familiar dodecahedron is the regular dodecahedron, which is a Platonic solid.There are also three regular star dodecahedra, which are constructed as stellations of the convex form.

mathcentral.uregina.ca/QQ/database/QQ.09.96/rosa1.html

After about 6 sides mathematicians usually refer to these polygons as n-gons. So your 13 sided polygon I would call a 13-gon. Cheers, Walter and Harley Go to Math Central. To return to the previous page use your browser's back button.

www.calculatorsoup.com/calculators/geometry-plane/polygon.php

Calculator online for a regular polygon of three sides or more. Calculate the unknown defining areas, circumferences and angles of a regular polygon with any one known variables. Online calculators and formulas for a regular polygon and other geometry problems.

To find the sum of the interior angles of a convex 12-sided polygon, you use the formula (n-2)180. n being the number of sides. Therefore,. (12-2)180 = 10(180) = 1800 degrees. So the sum is 1800 ...

A 12 sided 3D shape is called a dodecahedron. There is no polyhedron with only three sides - a polyhedron being a 3-D shape with plane sides.

www.reference.com/math/12-sided-polygon-called-52a8cb302e02b8cb

A 12-sided two-dimensional polygon is called a dodecagon. A regular dodecagon has 12 sides that are all the exact same length and internal angles that are 150 degrees each. Since there are 12 internal angles, the total internal angles add up to 1,800 degrees.

www.mathsisfun.com/geometry/polygons

Polygons A polygon is a plane shape with straight sides. Is it a Polygon? Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed" (all the lines connect up).

dls-website.com/documents/WoodworkingNotes/Polygon_Notes.pdf

Figure 5. Polygon geometry sides determine the third side of the triangle because R r l2 2 2 . Sides r and l ... Consider a hexagon to fit inside a circle having a diameter of 1.7 in. The ... Figure 7. Miter types 3. Table-Saw Methods for Making Polygonal-Shaped Objects Having Sides Without Slope

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