Solid Geometry
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Euclidean geometry, non euclidean geometry. Plane geometry. Three dimensional geometry to name but a few
triangular pyramid
Solid figures are normally classed as 3 dimensional objects
A shape with 8 faces is called an octahedron. An octahedron is a polyhedron with eight faces, each of which is an equilateral triangle. It is a three-dimensional shape that is commonly used in geometry and mathematics.
We call it a circle.