[tex]AB:BC=3:7\to AB=3x,\ BC=7x\\\\AB+BC=AC\to3x+7x=120\\\\10x=120\ \ \ |:10\\\\x=12\\\\BC=7x\to BC=7(12)=84[/tex]
Answer:
AB= 12 cm, BC= 8 cm
Step-by-step explanation:
A:B= C:B=3:2
AB=3/2 BC
AC = 20 = AB+BC
20 = 3/2 BC+BC
1 3/2 = 20
BC=8
AB= 20-8=12
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