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# What are the names of polygons?

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Triangles, squares, rectangles, pentagons, hexagons and octagons are some of the most common polygons. A polygon is a plane figure with many sides made up of line segments.

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Polygons are named according to the number of sides they have. Triangles have three sides, quadrilaterals have four sides, and pentagons have five sides. Polygons with more than six sides are often called "n-gons," where n represents the number of sides the polygon has. A polygon with 15 sides, for example, would be called a 15-gon.

There are many examples of polygons in the world. Honeycombs are made up of many different hexagons, or six-sided shapes. Stop signs are one of the most-recognizable examples of an octagon. A mirror with four right angles and four equal sides is a square, which is a type of quadrilateral. The Pentagon building in Washington, D.C. got its name because it has five sides. Ceiling tiles come in several different shapes, from basic squares to intricate octagons.

Polygons are further classified as concave or convex. A concave polygon has what is known as a reflex angle. A reflex angle measures more than 180 degrees. Polygons without reflex angles are convex polygons. Triangles, quadrilaterals and pentagons are examples of convex polygons.

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## Related Questions

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An official soccer ball typically consists of 20 white hexagons and 12 black pentagons tightly stitched together for a puzzle-like fit. Manufacturers began using patches of leather hexagons and pentagons to construct soccer balls when upon realization that they created the most spherical shape.

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A hexagonal prism has eight faces, six of which are rectangles, and two of which are hexagons. A hexagonal prism consists of a top and bottom hexagon that are both joined by straight lines connecting each set of vertices.

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A dodecahedron is the name given to a polyhedron made up of 12 equal pentagons. It is one of the five Platonic solids: a group of regular, convex polyhedrons made up of congruent, polygonal faces.

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There are examples of pentagons in real life in man-made structures like the Pentagon in the United States, and also in nature in flowers like morning glories and okra. Other items, like home plates in baseball, are often in the shape of irregular pentagons.