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K, well there is no surface area of a triangle, because a triangle is a 2s figure. Surface area is for a 3d figure. To find the regular area of a triangle the formula is 1/2 of the base X the height :) gl :P
It is: base area+(4*triangle areas)
to find the surface area of the triangle we just need to multiply the length with breath. area=lengthXbreadth
A triangle is a flat area, therefore it has a surface area, not a volume. Density is unrelated to the problem; you would need some additional information to calculate the surface area.
Assuming that a sail is a triangle shape, the area of a triangle can be found by using a simple formula. Half the base or bottom multiplied by the height of the triangle and its tallest point will give surface area.