Heptagonal pyramids, if you consider the base a side. Octagonal pyramids, if you don't.
In 2-dimension it is an 'HEXAGON' In 3 dimension is is am HEXAHEDRON.
pyramids have a triangular base. As a triangle has three sides, the pyramid will have three sides. Although you can get square based pyramids which have four sides. ---------------------------------------------- The Egyptian pyramids are 4 sided not 3 sided.
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A 3-sided figure is called a triangle.
A 3-sided shape is called a triangle.or Polygon in general.
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
It is called a triangle.
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It's called a triangle.
A triangle
Triangle
A three-sided, two-dimensional polygon is called a "triangle".