SOLUTION: How do you find the area of a triangle?

Question 570511: How do you find the area of a triangle?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Many different ways. The most common one is

(b = base, h = height)

For the next several formulas, denote

a,b,c = side lengths
A,B,C = angles opposite from sides a,b,c
s = semiperimeter (=(a+b+c)/2)
r = inradius
R = circumradius

Other area formulas you'll see are

(Heron's formula)

where AB and AC are the vectors from A to B and A to C respectively

(excuse my sloppy notation of using A twice...treat them as different variables)
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