Triangle
Square
Pentagon
Hexagon
Octogon
Rumbus
etc lol
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A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
apolygon is a shape that has no curves ,is closed, and has more then three sides
Triangles have three straight sides.
It's called a "polygon".