U can either use Hero's formula by finding length of sides as a,b, and c then
Area = s(s-a)(s-b)(s-c) , where s =(a+b+c)/2 is half of the perimeter
Or you can also use determinant formula as suggested by kavincoolzz
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866
s(s-a)(s-b)(s-c) , where s =(a+b+c)/2 is half of the perimeter
