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K = 38 cm
AB + BC + AC = 38
AC - 8 + AC - 8 + AC = 38
3AC = 54
AC = 18 cm
AB = BC = AC - 8
AB = BC = 10 cm
panjang sisi segitiga tersebut
AB = 10 cm
BC = 10 cm
AC = 18 cm
Keliling segitiga= AB+BC+AC
38=(AC-8)+(AC-8)+AC
38=3AC-16
3AC=54
AC=18
AB=BC=AC-8cm
AB=BC=10cm