A DECAGON.
Here are the names of polygons, (2-dimensional figures) with the given number of sides.
3; Trigon (Triangle)
4; Tetragon (Quadrilateral).
5; Pentagon
6; Hexagon
7; Heptagon
8' Octagon
9; Nonagon
10; Decagon
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hectagon
A shape that has 10 sides (two dimensional) is called a decagon. A shape that has 10 faces (three dimensional) is call a decahedron.
decagon
A ten-sided 2D polygon is known as a decagon.
A shape with three sides is called a triangle.