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Heeron's formula states that:-
Semi perimeter (s) = a+b+c/2
Perimeter =   \sqrt (s(s-a) (s-b) (s-c)

2 5 2
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An important theorem in plane geometry, also known as Hero's formula. Given the lengths of the sides , , and and the SEMIPERIMETER of a triangle                                                                                                                               ( 1)                                Heron's formula gives the area  of the triangle as                                                                                                                                       ( 2)              Heron's formula may be stated beautifully using a caley mengar deteriment as