It depends on what information you have.
There are different formulae for when you know:
Most of these are reasonably straightforward to compute. There are more complex formulae to cater for other scenarios.
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Area of a triangle: 0.5*base*perpendicular height
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
The Illuminati
Area of triangle=√(s-a)(s-b)(s-c)
They are many ways to find the formula of a triangle. Base times height divided by 2