area = 1/2 x base x height
The base of the triangle is any side (usually one horizontal at the bottom) and the height is the shortest distance from this side to the opposite vertex.
The shortest distance is when a line drawn from the vertex meets the side at 90o (the perpendicular distance).
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There are different formulae depending on what information is given: base and height, two sides and an angle, three sides etc.
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
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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