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A^2=s(s-a)(s-b)(s-c)
Determinamos s:
s=(a+b+c)/2
s=(100+70+60)/2
s=230/2
s=115
Sustituimos:
A^2=115(115-100)(115-70)(115-60)
A^2=4269375
A=√4269375
A=2066.24 m^2