Răspuns:
AS = 20 cm
Explicație pas cu pas:
P(ABC) = 96 cm
→ AB + AC + BC = 96 cm
P(ASB) = 72 cm
→ AS + AB + BS = 72 cm
P(ASC) = 64 cm
→ AS + AC + SC = 64 cm
BC = BS + SC
AS + AB + BS + AS + AC + SC = 72 + 64
2•AS + AB + AC + BC = 136
2•AS = 136 - 96
2•AS = 40 ⇒ AS = 20 cm