Another name for population pyramid is Age-Sex graphs.
population pyramid;decrease (apex)
A bell-shaped population pyramid shows a near constant population like the population of Australia which is tampered towards the South.
Rapid growth­population
Population Pyramid .
A pyramid
Another name is tetrahedra
Age structure diagramA population pyramid, also called an age pyramid or age picture diagram, is a graphical illustration that shows the distribution of various age groups.
The Pyramid Age is another name for Egypt's Old Kingdom:Because Egypt had three kingdom ages.
A tetrahedron.
the pyramid age
the old kingdom.
the old kingdom.
altitude
A triangular pyramid.
Altitude
altitude
A tetrahedron.