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Polygons are named by the Greek prefix of their total number of internal angles. Greek prefix for eleven is hendeca. So it would have name Hendecagon. Look here for more information: http://mathforum.org/dr.math/faq/faq.pol...
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Hendecagon is 11. Dodecagon is 12.
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A 20 sided shape is a polygon called an icosagon. The icosagon has interior angles that total 3240 degrees. Therefore, each interior angle is 162 degrees.
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A seven sided shape is called a heptagon. A polygon is named by the number of sides it has using a prefix that denotes the specific number; hence pentagon (5 sides), hexagon (6 sides), heptagon (7 sides), octagon (8 sides), etc.
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A decagon is a polygon with 10 sides. A decagon with equal sides and angles is called a regular decagon. Every decagon has ten sides, ten angles and ten points.
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hendecagon
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A six sided shape in geometry is commonly referred to as a polygon. To be more specific, a six sided shape in geometry is called a hexagon.
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A five sided shape is called a pentagon. The well known military headquarters in Washington D.C. has a pentagonal shape. All of its sides are the same length but a pentagon only must have five sides. They can be of different lengths.
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a heptagon is a shape with 11 sides!
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A geometric shape that has twelve sides is called a dodecagon. Dodecagon shapes are not commonly used in everyday life items. However, there are a few countries that use the dodecagon shape for some of their coins.
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An 11 sided shape is called a hendecagon. Hendecagons are polygons. The hendecago is sometime also called the undecagon. Each interior angle of a regular hendecagon is 147.27 degrees.
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A polygon with nine sides and nine angles is called a nonagon. A nine-faced polyhedron, however, is called a nonahedron, and there are 2,606 of those!
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A six sided shape is a hexagon. A hexagon can have sides that are all the same length (regular) or different lengths (irregular), both are still considered a hexagon.
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A 12-sided shape or polygon is called a dodecagon. An interior angle of a dodecagon is equal to 150 degrees and the sum of all the interior angles is equal to 1800 degrees. You can find more information here: http://www.mathopenref.com/dodec...
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Okay, you are taking me back to elementary school with this one. A nine-sided shape is called a nonagon. Now, you and I both know what it's called!
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A ten sided shape is a decagon. A decagon is a form of polygon which just means a shape with many straight sides. The most popular would probably be octagon which is the shape of a stop sign.
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A 5 sided shape is called a pentagon. The interior angles of a pentagon add up to 540 degrees. A pentagon is a polygon. The most famous pentagon is The Pentagon in Washington, D.C. It houses the US Department of Defense.
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