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Put the three points in a matrix with the last column with ones. Then find the determinant, then multiple by .5
Example:
(1,1) (2,4)(4,2)
1 1 1
2 4 1
4 2 1
The determinant is: [(1*4*1)+(1*1*4)+(2*2*1)]-[(1*4*4)+(1*2*1)+(1*2*1)]=12-20=
-8
Therefore you must multiple by -.5= 4
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