Question

The great pyramids at giza were built during which of the following periods

Answer 1

I believe they were built during 2630bc. Also during the third dynasty

Answer 2

You didn't provide any answer choices so this is what I found...

The Great Pyramid of Giza was built for the Fourth Dynasty Pharaoh Khufu (or Cheops), and was completed around 2560 BCE.

This is mathematics, I think you meant to put this in History, lol. I hope my answer helps. I'm not sure if it was the answer you were looking for though. :)