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What does ריש חזית mean?

I'm reading(/trying to read) the introduction to the Vilna Gaon's איל משולש (his geometry textbook). The first two words are ריש חזית.

What does ריש חזית mean?

If it helps, the phrase is immediately followed by a passuk from kohelet and then a midrash.

http://www.hebrewbooks.org/pdfpager.aspx?req=20365&st=&pgnum=155&hilite=