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Daca a, b, c sunt  lungimile laturilor unui triunghi ABC, atunci

a r i a space S subscript capital delta A B C end subscript space equals square root of p left parenthesis p minus a right parenthesis left parenthesis p minus b right parenthesis left parenthesis p minus c right parenthesis end root space space comma space u n d e space p equals fraction numerator a plus b plus c over denominator 2 end fraction space left parenthesis space f o r m u l a space l u i space H e r o n space right parenthesis

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Lungimile laturilor unui triunghi sunt 37 , 35, si 12.  Daca notam cu P perimetrul triunghiului si cu S aria triunghilui, atunci :

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