it is a triangular pyrimid
pyramid
square
The regular solid, with 20 identical equilateral triangular faces, is called an icosahedron.
'Enneahedron' - a solid figure with nine faces
A solid figure with twenty faces is called an Icosahedron.
were two or more faces of a solid figure
A solid figure with a polygonal base and triangular faces that meet at a common point.
Hexahedron
Polygonal faces.
No.
A decaredra is the ten face solid figure.
No. All the faces of a Platonic solid are identical regular polygons.