A regular octagon
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A three-dimensional shape with eight triangular faces is called an octahedron.
A pentagon
A three-sided shape is called a triangle. There are three types of triangles: equilateral triangles, iscosceles triangles, and scalene triangles. Equilateral triangles have all equal sides and angles; iscosceles triangles have two congruent legs and a base, and scalene triangles do not have any equal sides or angles.
A shape with 8 equal sides is called a regular octagon.
A regular 8 sided octagon has eight equal sides.