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Locations
the mast nearest the bow shorter than the mainmast the chief, tallest mast of a ship.
Generally fore and aft rigged.
Schooners can carry more sail area than a similarly sized ketch or yawl.
What's the shape of the mainsail 
the sail right behind the mainmast, usually the largest?
Triangular
It's Bermuda Rigged
See Bermuda Schooners
Quadrilateral, held
on top by a gaff
It's Gaff Rigged