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A polygon having 10 sides is called:
A. Octagon
B. Decagon
C. Dodecagon
D. None of these

Answer
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Hint:The given problem is related to shapes and their names. Try to recollect the names of various polygons and the number of sides that they have.

Complete step-by-step answer:
A polygon is any 2-dimensional closed figure formed with straight lines. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons. The name tells you how many sides the shape has. For example, a triangle has three sides, and a quadrilateral has four sides. So, any shape that can be drawn by connecting three straight lines is called a triangle, and any shape that can be drawn by connecting four straight lines is called a quadrilateral.
Polygons with sides of equal lengths are called regular polygons. For example: A square has all its sides equal. Hence, it is a regular polygon.

ShapeNumber of sides
Triangle3
Quadrilateral4
Pentagon5
Hexagon6
Heptagon7
Octagon8
Nonagon9
Decagon10
Undecagon11
Dodecagon12

Now, from the table we can see that octagon is a polygon with 8 sides, decagon is a polygon with 10 sides and dodecagon is a polygon with 12 sides.
Hence, a polygon with 10 sides is known as decagon.
So, option B is the correct option.

Note: Remember the names of the polygon for the respective number of sides. Students may face difficulties if they are not able to remember the names of the polygon. These confusions can result in wrong answers. So, the names of the polygons must be remembered properly.
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