It is easy there are two methods that work the same. Base times hight divided by two or half the base times hight. It works out the same and will give you both the same answer! Try it!
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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