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First find S 
S= 1/2 x ( a+b+c )

then Area by using the below Formulae 
A=  \sqrt{s(s-a)+(s-b)+(s-c)}
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Area=sqrt[s(s-a)(s-b)(s-c)] where s= a+b+c/2 a,b and c are length of sides of triangle s is the semi perimeter
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