They were made at least as far back as 4000 years ago. They've been made as recently as 500-1000 years ago.
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The very first pyramid was built in 2750 bc
Along the base, each side was about 760 feet long. the core was built from 2.3 billion blocks of stone.
It all depends on what pyramid that you are wondering about because each pyramid was hand made and each one differently. Some of the blocks used in the Great Pyramid of Giza King's chambers weighed around 9 tons and the blocks used in the other parts weighed around 2.5 tons.
a pyramid can use any triangles possible.
It has many passage ways threw out the whole pyramid