Question

calculati aria unui triunghi cu lungimile laturilor de 3 cm 6 cm 7 cm

Answer 1

Aplicam formula lui Heron:
$Aria= \sqrt{p (p-a)*(p-b)*(p-c)}$
p-semiperimetrul=(a+b+c)/2=(3+6+7)/2=16/2=8
$Aria= \sqrt{8(8-3)(8-6)(8-7)}$
$Aria=\sqrt{8*5*2*1}$
$Aria=\sqrt{80}=4 \sqrt{5} cm^2$