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Locations
Having one mast and one jib carry a single jibA triangular sail set in front of the foremast. Cutters Having two or more jibs carry more than one foresail, and usually the mainmast is stepped further aft to compensate.
What's the shape of the mainsail 
the sail right behind the mainmast, usually the largest?
Triangular
It's Bermuda Rigged
See Bermuda Sloops
Quadrilateral, held
on top by a Gaff
It's Gaff Rigged