Răspuns:
EC = EA + AC = 4 + 9 = 13 cm
In ΔEAB calculam BE
BE² = AB² + EA²
BE² = 6² + 4²
BE² = 36 + 16 = 52
BE = √52 = 2√13 cm
IN Δ EBC calculam BC
BC² = EC² - EB²
BC² = 13² - (2√13)²
BC² = 169 - 52 = 117
BC = √117 = 3√13 cm
P = 13 + 2√13 + 3√3 = 13 + 5√3 cm
