An eight-sided shape is known as an octagon. Octagons are flat shapes with eight straight sides.
Know MoreOctagons have certain characteristics that set them apart from other shapes. Octagons can be regular or irregular. When an octagon is regular, it has all equal sides. If the sides are not equal, the octagon is classified as irregular. The octagon can also be convex, with no angles pointing inwards or concave, with an angle pointing inwards. To be classified as an octagon, the shape in question must have a closed diameter with all sides connecting up. Generally, a regular octagon has 135-degree interior angles and 45-degree exterior angles.
Learn more about ShapesAn octagon has eight sides. The word derives from the Greek words "okto" meaning "eight" and "gonia" meaning "angle." In many countries throughout the world, an example of an octagon seen in everyday life is the red "Stop" sign.
Full Answer >A pentagon is the name for a five-sided polygon. However, there are different types of five-sided polygons, such as irregular, regular, concave and convex pentagons.
Full Answer >The name of an eight-sided shape is an octagon. In addition to the eight sides, the octagon also has eight vertices and eight interior angles. The interior angles add up to 1080 degrees.
Full Answer >A 15-sided shape may be called a pentadecagon or pentakaidecagon, depending on who is doing the naming. More often, it is a polygon, which is an enclosed shape with any number of sides that do not cross. Polygons can be all convex, or they can be a combination of concave and convex vertices.
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