An octagon
A three-dimensional shape with eight triangular faces is called an octahedron.
A "dodeca" is a prefix: it is not a shape. An octahedron has eight faces.
A hexagon. (A six-sided shape) * * * * * A regular octahedron.
In geometry, a octahedron is a poly-hedron/ multi-faced shape with eight sides.
A shape with six rectangular sides is known as a rectangular prism, also referred to as a cuboid. Each of its six faces is a rectangle, and it has opposite faces that are congruent. This three-dimensional shape has eight vertices and twelve edges.
An octahedron is a closed solid shape with eight polygonal faces.
That's impossible. A shape has three or more sides/faces. There is NO shape that has one or two sides/faces
Shapes have sides. Do you mean, what shape has 6 sides or, what solid has 6 faces?
Sides and faces are the same thing, and an octahedron has eight.
There is no specific name for such a shape.
A shape's sides are called faces.
What polyhedron has eight sides and all of the are equilateral triangle?