We don't know for certain who discovered the platonic solids first. However, Pythagoras is credited by some sources as discovering the platonic solids first. Other sources credit Theaetetus as being the first to describe all five platonic solids and proving that these are the *only* platonic solids.
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The book called Platonic Solids: The experience
There are different numbers on the different platonic solids.
The Platonic solids were name after the Greek philosopher Plato, who theorized that the classical elements were constructed from the regular solids.
Euclid was the one who proved that there are only five platonic solids.
Because 6 platonic solids would be too many, and 4 wouldn't be enough