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The Heron's Formula is used to find the area of triangle with all three sides of different length and whose height is not given.
Heron's Formula is √s(s-a)(s-b)(s-c) 
                           where s = semi perimeter 
                                     a,b and c are the sides of triangle .
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Heron formula: root under s (s-a)(s-b)(s-c)
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