What Do You Call A Shape With 9 Sides?
Geometry is one of the most fascinating subjects that can be both simple and complex at the same time. It involves the study of shapes and their properties. One of the most interesting shapes in geometry is the one with nine sides. The question is, what do you call a shape with nine sides? In this article, we will explore the answer to this question and some interesting facts about this shape.
Polygons
Polygons are two-dimensional shapes that are made up of straight lines. They are classified based on the number of sides they have. Some of the most common polygons include triangles, quadrilaterals, pentagons, hexagons, heptagons, octagons, nonagons, and decagons. A polygon with nine sides is called a nonagon.
The Properties of a Nonagon
A nonagon is a closed shape with nine straight sides and nine angles. The sum of the interior angles of a nonagon is 1260 degrees. Each angle in a regular nonagon measures approximately 140 degrees. A nonagon can be either convex or concave. A convex nonagon has all its interior angles less than 180 degrees, while a concave nonagon has at least one interior angle greater than 180 degrees.
Real-Life Examples of a Nonagon
Nonagons are not as common in real life as triangles, rectangles, and circles. However, there are a few instances where nonagons can be seen. For example, the United States one-cent coin, also known as a penny, has a nonagon shape on its back. Moreover, some stop signs also have a nonagon shape, although they are often mistaken for octagons.
Nonagons in Art and Architecture
Nonagons are also used in art and architecture. In Islamic art, nonagons are used to create intricate geometric patterns. In architecture, nonagons are used in the design of buildings and structures. For example, the Nonagon Pavilion in Portugal is a unique structure that was built for the 1998 World Exposition. The building has a nonagon shape and features nine towers that represent the nine provinces of Portugal.
Nonagons in Mathematics
Nonagons have some interesting mathematical properties. For example, a nonagon can be divided into 27 triangles of equal area. Moreover, a nonagon can be used to create other shapes, such as the enneagram, which is a nine-pointed star. Nonagons can also be used to create tessellations, which are patterns made up of repeating shapes.
Conclusion
In conclusion, a shape with nine sides is called a nonagon. It is a closed shape with nine straight sides and nine angles. Nonagons are not as common as triangles, quadrilaterals, and circles, but they can be seen in real-life examples such as the United States one-cent coin and some stop signs. Nonagons are also used in art, architecture, and mathematics. They have some fascinating properties that make them an interesting subject of study in geometry.
So, the next time you come across a shape with nine sides, you know exactly what to call it!
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