decagon
A polygon have 4 or more sides. It has no gaps between it. Regular polygons usually have six or ten sides.
There is no special name: they are polygons, as are shapes with 3 or 3 million sides.
pentagon (5 sides) hexagon (6 sides) heptagon ( 7 sides) octagon (8 sides) nonagon (9 sides) decagon (10 sides)
The first ten polygons in order of names and sides are as follows:- Triangle has 3 sides Quadrilateral has 4 sides Pentagon has 5 sides Hexagon has 6 sides Heptagon has 7 sides Octagon has 8 sides Nonagon has 9 sides Decagon has 10 sides Undecagon has 11 sides Dodecagon has 12 sides
A regular decagon.
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''Decagon'' is any polygon with ten sides and ten angles ''Regular decagon'' is a polygon with ten sides of equal length and all angles equal to 144°
Ten of them.
The name of a regular polygon, with ten equal sides and ten equal angles, is a decagon, from the Greek word "deka", meaning ten.
The shape is called a decagon. If all the sides and angles are the same, it is called a regular decagon.
A shape with three sides is called a triangle. A shape with ten sides is called a decagon.
The sum of the measures of the exterior angles of any polygon, regular or irregular, is always 360 degrees. In a regular polygon with ten sides, each exterior angle measures 360 degrees divided by the number of sides, which in this case is 36 degrees. Therefore, the sum of the measures of the exterior angles of a regular decagon is 10 multiplied by 36 degrees, which equals 360 degrees.