Question

Va rog frumos ajutati-ma..conform formulei lui Heron stiu ca se rezolva.

Answer 1

p=$\frac{AB+BC+AC}{2} =\ \textgreater$
p=$p= \frac{13+14+15}{2}$
p=21
$S_{ABC}= \sqrt{{(21-13)(21-14)(21-15)}$
 S_{ABC}= \sqrt{{(7)(8)(6)}  
 S_{ABC}= \sqrt{{336}
 S_{ABC}= 4$\sqrt{21}$ $cm^{2}$