No idea. It depends on what you mean by pryamids!
Not sure about pryamids, but pyramids are definitely NOT triangles.
Stone
about 80 to 100 roughly!
Khufu
from 2900bc until 1400bc
In the bottom or the dungeons of pryamids or caves.
about 108
P-Y-R-A-M-I-D-S.
The Egyptian pyramids are used as a burial place or a "gateway" to the gods.
the cahokia pryamids, and other mounds, sears tower.
Egyptians. Don't ask here if you are not looking for answers from others.
The Pyramids were built between 2700 B.C. to 1500 B.C. during the Old Kingdom