nobody has any idea, as there was no technology back then. they suspect it took decades, and millions of men.
It was built to protect the Pharaoh Khafre's tomb after he was embalmed. Do some research to find out how it was built, because I don't know.
the great sphinx of Giza was built at about 2500 -2530 BC
It was built because it resembled king Pharaoh Kharfre and it guarded his tomb stone
by the monsters of la la land
For King Khufu's body to be placed there after he died.
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