A tetrahedron.
A triangularbased pyramid (tetrahedron) has 4 faces, 6 edges and 4 vertices
Another name for population pyramid is Age-Sex graphs.
Another name is tetrahedra
The Pyramid Age is another name for Egypt's Old Kingdom:Because Egypt had three kingdom ages.
A tetrahedron.
the pyramid age
A triangular pyramid.
the old kingdom.
the old kingdom.
altitude
A tetrahedron.
The Old Kingdom