4.5 million BC
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It would have been 149,997,988 years BC (in 2013). But, assuming that 150 million is, at best, accurate to the nearest million years, for all intents and prposes, the answer should be 150 million years BC.
Euclid's "The Elements," is a geometric treatise consisting of 13 books written by him circa 300 BC. However, it was compiled from the works of several earlier mathematicians from earlier centuries.
Pythagoras was born around 570 BC, about 235 years earlier than Euclid.
1,000,000 x 1,000,000 = 1,000,000,000,000. So yes, 1 million x 1 million = 1 trillion.
BC' + BC' = 2BC'