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Herons formula gives the area of a triangle when the lengths of three sides of a triangle are given.
Let the sides of the triangle are a, b and c. Let s be half the perimeter or 

s =  \frac{a+b+c}{2}

Then area of the triangle is given by

A= \sqrt{s(s-a)(s-b)(s-c)}
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the whole square root of - s(s-a)(s-b)(s-c)

where a,b,c are sides of triangle and s is the semiperimeter - s=a+b+c whole divided by2

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