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Fie ABC un triughi cu AB=AC. Stiind ca AB+BC=110m, BC-AB=30m, adla PERIMETRUL triunghiului. REPEDEEEEEEE VAAAAA ROOOOOG!!!

Răspuns :

AB+BC=110
BC=110-AB
BC-AB=30
BC=30+AB
110-AB=30+AB
110-30=AB+AB
80=2AB
AB=80:2
AB=40 cm

AB=AC
AC=40 cm

BC=110-AB
BC=110-40
BC=70 cm

Verificare: AB+BC=110
40+70=110