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13^2 = 5^2 + AC^2
169 = 25 + AC^2
AC^2 = 169 - 25
AC^2 = 144
AC = akar 144 = 12
jd AC = 12
keliling segitiga = a + b + c
= 13 + 12 + 5
= 30
dengan demikian keliling segitiga tersebut adalah :
AB + AC + BC = 5 + 12 + 13 = 30 cm