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A polygon that has ten sides is called?
A. Octagon
B. Nonagon
C. Decagon
D. Heptagon
Correct Answer Is Option = Decagon
Notes / Explanation
A polygon that has ten sides is called a decagon, and this is part of the system by which shapes with straight sides are named according to how many sides they possess, a topic within the branch of mathematics that deals with shapes, known as geometry. A polygon is a flat, closed shape made up of straight sides, and each polygon is given a name according to the number of its sides, with most of these names coming from words that indicate the number in question. Thus a shape with three sides is a triangle, a shape with five sides is a pentagon, a shape with six sides is a hexagon, a shape with seven sides is a heptagon, a shape with eight sides is an octagon, a shape with nine sides is a nonagon, and a shape with ten sides is a decagon. The word decagon comes from a word meaning ten, and so a ten-sided shape is called a decagon. A decagon has ten sides and ten corners, and therefore ten angles. A regular decagon is one in which all ten sides are of equal length and all ten angles are equal, producing a symmetrical shape, while an irregular decagon has sides or angles that are not all equal. As the number of sides of a polygon increases, the shape comes to look more and more rounded, so that a regular polygon with a large number of sides begins to resemble a circle, and a regular decagon, with its ten equal sides, is already a fairly rounded shape. The naming of polygons according to the number of their sides is a basic and useful part of geometry, allowing shapes to be described precisely, and the system continues in the same way for shapes with even more sides. Being familiar with the names of the common polygons, from the triangle up to the decagon and beyond, is helpful both in the study of mathematics and as a piece of general knowledge, and questions asking for the name of a shape with a particular number of sides, or the number of sides of a named shape, are commonly encountered. For PPSC and other competitive examinations, the key points to remember are that a polygon with ten sides is called a decagon, that polygons are named according to the number of their sides, that a decagon has ten sides, corners and angles, and that as the number of sides increases a regular polygon comes to resemble a circle more closely.
