It is called a triangle.
three-sided polygon is called a triangle, from the Greek word "tri" meaning "three" as in tricycle, or tripod. from : espi
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A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
A 3-sided shape is called a triangle.or Polygon in general.
Its called a pentahedron. Its a five sided or faceted polygon.
a 4 sided shape is called a quadrilateral
A 12 sided figure is called a dodecagon. A 3-dimensional shape with 12 faces is called a dodecahedron.