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First of all take out "s"( half of ∆'s perimeter )....... Its formula--> s=a+b+c/2............ Now area of ∆= √s(s-a)(s-b)(s-c)------> whole formula is under root....
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Let l,b,h are the sides of triangle D=(l+b+h)/2 Total Area of triangle=√D*(D-l)(D-b)(D-h)
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