Question

Fie ABC un triunghi isoscel de baza [AB] care are semiperimerimetrul egal cu 17 cm.Daca: a) AB=14 cm,aflati AC. b) AB=11 cm,aflati BC

Answer 1

P/2=17 cm⇒ P=17×2=34 cm
ΔABC isoscel ⇒[AC]≡[BC]⇒AC=BC
P=AB+AC+BC = AB+2AC sau P=AB+2BC
a) 34=14+2AC
    2AC=34-14
    2AC=20
    AC=20÷2
    AC=10 cm
b) 34=11+2BC
    2BC=34-11
    2BC=23
    BC=23÷2
    BC=11,5 cm