He didn't discover Venus. Venus is one of the brightest objects in the sky (after the sun and moon), so it's been observed ever since cave men looked up.
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he played the lyre
Cause
he dicovered it in greece
Discover of a Mathematical formula to relate the sides of a right triangle.
the pythagorean theorem i would just like to say that he did not discover that, it was found in 800 B.C