A 3-sided shape is called a triangle.
or Polygon in general.
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Septagon or Heptagon = seven sided shape
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
A 4 sided shape is classified as a quadrilateral.
A 4 sided shape has 4 vertices whereas a 3 sided shape has 3 vertices.
It's a 6 sided shape.