Possible Clues:

• Greek geometrician of Alexandria
• European Union's first to congratulate top mathematician
• Book of geometry
• He might help one to figure out one twisted clue I had
• Space explorer that I clued badly
• Great Greek mathematician, notable for geometry
• Silly clue I had for geometry master
• With a new clue I'd get the mathematician
• Guide for those to whom geometry is all Greek
• Greek math whiz