Square footage of a triangle

Answer 1

The answer depends on what information about the triangle you do have. There are formulae if you know 3 sides or 2 sides and the included angle.

Then there are other formulae to find these variables if another set - for example, two angle and a side - are known.

Three sides of length a, b and c:

Let s = (a + b + c)/2

Area = sqrt{s*(s-a)*(s-b)*(s-c)}

Two sides a, b and the included angle, C:

Area = 1/2*a*b*sin(C)