height = 3m
The area (A) of a triangle is.
##color(red)(|bar(ul(color(white)(a/a)color(black)(A=1/2bh)color(white)(a/a)|)))##
where b is the base and h the perpendicular height.
here A = 3.75 and b = 2.5 .Require to find h.
##rArr1/2xx2.5xxh=3.75rArr1.25h=3.75##
divide both sides by 1.25
##(cancel(1.25) h)/cancel(1.25)=3.75/1.25##
##rArrh=3m is the height of the sail##