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
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Assuming the cross-section is an equilateral triangle with sides of 'a' and the length is 'b' the surface area will be 3ab + SQRT(3).a2
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.
It depends on the size of the triangular prism, but depending on the side of the prism you use the triangle area formula to find it or the rectangle area formula to find it.
2*area of triangular base + perimeter of triangle*length of prism.
Area of a triangle: 0.5*base*perpendicular height