Question

Calculati aria triunghiului ABC daca :
AB= 5cm si AC=8cm si BC =cm

Answer 1

Folosim formula lui Heron.

$p= \frac{AB+BC+AC}{2}= \frac{5+7+8}{2}=10(cm). \\ \\ A= \sqrt{p(p-AB)(p-BC)(p-AC)}= \\ = \sqrt{10*5*2*3} = \\ =10 \sqrt{3}(cm ^{2} )$