Answer:
Step-by-step explanation:
Alright, lets get started.
Please refer the diagram I have attached.
Suppose the base of right triangle sail is b
Suppose the height of right triangle sail is h
It is given that, it is three times higher as it is wide.

Area of right triangle is A = 

Plugging the value of h in terms of b



Hence height h = 
Hecne the height of sail is 6 meters. : Answer
Hope it will help :)