SOLUTION: {{{A=1/2}}}{{{abs(matrix(3,3,a,b,1,c,d,1,e,f,1))}}}

Algebra.Com
Question 148413:
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!



That's the formula for the area of a triangle whose
vertices are (a,b), (c,d), and (e,f) going around the
triangle counter-clockwise.

Example:

Suppose we want to find the area of the triangle whose
vertices are (4,3), (-5,7), (3,-6).   Those are in
counter-clockwise order.



We just plug those corner points into the formula:



Edwin
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