A Trimaran is a boat with three hulls.
A catamaran (or just a 'cat') has two hulls on both sailboats and power boats A trimaran has more than two.
A trimaran has 3 hulls, a main hull and two smaller outrigger hulls.
Boat hulls are currently usually made of fiber glass. Fiber glass is the cheapest, most effective material. Boat hulls can also be made of wood, carbon fiber, and steel.
Trimaran
This type of boat is called a Catamaran.
Catamaran.
A trimaran is a sailing yacht with three parallel hulls.
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Trimaran
Tri-hull